Glass Insulator Markings

A - B - C - D - E - F - G - H - I - J - K - L - M- N - O - P - Q - R - S - T - U - V - W - X - Y - Z

Markings (Country)
Meaning of markings

Logo
If applicable

 

A.A. (Mexico)
Unknown

A.A. Logo (Mexico)

A.G.E.E. (Australian)
Australian Glass

No Logo
Text only Embossing

A.G.M. (Australian)
Australian Glass

No Logo
Text only Embossing

A.T.& T.CO. (USA)
American Telephone & Telegraph

No Logo
Text only Embossing

A.U. (USA)
American Union

No Logo
Text only Embossing

AM.INSULATOR CO. (USA)
American Insulator Company

No Logo
Text only Embossing

AM.TEL.& TEL.CO. (USA)
American Telephone & Telegraph Company

No Logo
Text only Embossing

ARMSTRONG (USA)

Armstrong Logo (USA)

AYALA (Mexico)
Unknown

AYALA Logo (Mexico)
 

BARCLAY (USA)

No Logo
Text only Embossing

B & O (USA)
Baltimore & Ohio

No Logo
Text only Embossing

B.C.DRIP (Canada)
Unknown, Maybe British Columbia?

No Logo
Text only Embossing

B.E.L.CO. (USA)
Unknown

No Logo
Text only Embossing

BEAL'S (USA)

No Logo
Text only Embossing

B.F.G.CO. (USA)
Beaver Falls Glass Company

No Logo
Text only Embossing

B.G.M.CO. (USA)
Baltimore Glass Manufacturing Company

No Logo
Text only Embossing

BIRMINGHAM (USA)
Baltimore Glass Manufacturing Company

No Logo
Text only Embossing

Borgo (Italy)

No Logo
Text only Embossing

BOSTON BOTTLE WORKS (USA)

No Logo
Text only Embossing

B.T.C. (Canada)
Bell Telephone Company

No Logo
Text only Embossing

B (USA)
BROOKFIELD (USA)
Brookfield

No Logo
Text only Embossing

BROOKE'S (USA)

No Logo
Text only Embossing

BUZBY (USA)

No Logo
Text only Embossing

 

C.& P.TEL.CO. (USA)
Chesapeake & Potomac Telephone Company

No Logo
Text only Embossing

C.C.G. (Australian)
Crown Crystal Glass Company Ltd.

No Logo
Text only Embossing

C.D.& P.TEL.CO. (USA)
Central District & Printing Telegraph Company

No Logo
Text only Embossing

C.E.L.CO. (USA)
Cambridge Electric Light Company

No Logo
Text only Embossing

C.E.W. (USA)
CAL.ELEC.WORKS (USA)
California Electric Works

No Logo
Text only Embossing

C.G.I.CO. (USA)
California Glass Insulator Company

No Logo
Text only Embossing

C.N.R. (Canada)
Canadian Northern Railway

No Logo
Text only Embossing

C.P.R. (Canada)
CANADIAN PACIFIC RY.CO. (Canada)
Canadian Pacific Railway

No Logo
Text only Embossing

CABLE (USA)

No Logo
Text only Embossing

CALIFORNIA (USA)

No Logo
Text only Embossing

CANADA (Canada)

No Logo
Text only Embossing

CHAMBERS (USA)

No Logo
Text only Embossing

CHESTER (USA)

No Logo
Text only Embossing

CHICAGO INSULATING CO. (USA)
Chicago Insulating Company

No Logo
Text only Embossing

CIA COMERCIAL (Mexico)
Compania Comercial
(Commercial company)

No Logo
Text only Embossing

CIA TELEFONICA (Mexico)
Compania Telefonica
(Telephone company)

No Logo
Text only Embossing

CIN COM (Cuba)
Unknown

No Logo
Text only Embossing

CITY FIRE ALARM (USA)

No Logo
Text only Embossing

CLIMAX (USA)

No Logo
Text only Embossing

COLUMBIA (USA)

No Logo
Text only Embossing

COMBINATION SAFETY (USA)

No Logo
Text only Embossing

CONVERSE (USA)

No Logo
Text only Embossing

CRIMSA (Mexico)

No Logo
Text only Embossing

CRISA (Mexico)

No Logo
Text only Embossing

CRISOL TEXCOCO (Mexico)

Logo
Photo Wanted!

CROWN (USA)

No Logo
Text only Embossing

CTC (Mexico)
Unknown

No Logo
Text only Embossing

 

D.T.CO. (Canada)
Dominion Telegraph Company

No Logo
Text only Embossing

DERF (Mexico)
DERFLINGHER (Mexico)
Derflingher

No Logo
Text only Embossing

DIAMOND <> (Canada)

Diamond Logo (Canada)

DIAMOND P (USA)

Diamond P logo (USA)

DOMINION (Canada)

Dominion Logo (Canada)

DRY SPOT INSULATOR (USA)

No Logo
Text only Embossing

DUPONT (Canada)

No Logo
Text only Embossing

DUQUESNE (USA)

No Logo
Text only Embossing

DWIGHT (Canada)

No Logo
Text only Embossing

 

E.C.& M.CO. (USA)
Electrical Construction & Maintenance Company

No Logo
Text only Embossing

E.D.R. (Canada)
Edmonton Dunvegan Railway

No Logo
Text only Embossing

E.L.CO. (USA)
Edwin Lewis Company

No Logo
Text only Embossing

E.R. (USA)
Erie Railway

No Logo
Text only Embossing

E.R.W. (USA)
Erie Railway Western

No Logo
Text only Embossing

E.S.A. (Spain)
Esperanza S. A.

No Logo
Text only Embossing

E.S.B.CO. (USA)
Electric Storage Battery Company.

No Logo
Text only Embossing

E.S.S.CO. (USA)
Electrical Service & Supply Company

No Logo
Text only Embossing

EIV (France)
Europeenne d' Isolateurs en Verre
(European Insulators made out of Glass)

No Logo
Text only Embossing

ELECTRICAL SUPPLY CO. (USA)
Electrical Supply Company

No Logo
Text only Embossing

EMMINGER'S (USA)

No Logo
Text only Embossing

ERICSSON (Mexico)

No Logo
Text only Embossing

 

FALL RIVER (USA)

No Logo
Text only Embossing

F.F.C.C.N.DE M. (Mexico)
Ferrocarriles Nacionales de Mexico
(National railroads of Mexico)

No Logo
Text only Embossing

FISHER (USA)
Frank E Fisher

No Logo
Text only Embossing

FIDENZA (Italy)

Manufacture Embossings:
2205 means 2 two shells
2 two parts
05 rating 5 kV  (previous numbering system)

6205 means 6 series 6000 (early '60s)
2 two parts
05 rating 5 kV
 
low voltage 6118  6 means series 6000
1 bell type
18 cat. number

UNEL: unificazione elettrotecnica

No Logo
Text only Embossing

FLOY (USA)

No Logo
Text only Embossing

FOSTER (USA)

No Logo
Text only Embossing

FLUID INSULATOR (USA)

No Logo
Text only Embossing

FT.W.E.CO. (USA)
Fort Wayne Electric Company

No Logo
Text only Embossing

 

G.E.CO. (USA)
GENERAL ELECTRIC CO. (USA)
General Electric Company

No Logo
Text only Embossing

G.N.R. (Canada)
Great Northern Railway

No Logo
Text only Embossing

G.N.W.TEL.CO. (Canada)
GREAT NORTHWESTERN (Canada)
Great Northwestern Telegraph Company

No Logo
Text only Embossing

G.P.R. (Canada)
Great Pacific Railway

No Logo
Text only Embossing

G.T.P.TEL.CO. (Canada)
Grand Trunk Pacific Telegraph Company

No Logo
Text only Embossing

GAYNER (USA)
Gayner Glass Works

No Logo
Text only Embossing

GOOD (USA)
Robert Good, Jr

No Logo
Text only Embossing

GREELEY (USA)
E. S. Greeley & Co

No Logo
Text only Embossing

GREGORY (USA)
Ferdinand W Gregory

No Logo
Text only Embossing

 

HAMILTON (Canada)
Hamilton Glass Works

No Logo
Text only Embossing

HARLOE (USA)
HAWLEY (USA)
Harloe Insulator Company

Harloe Logo (USA)

H.B.R. (Canada)
Hudson Bay Railway

No Logo
Text only Embossing

H.G.CO. (USA)
HEMINGRAY
Hemingray Glass Co

No Logo
Text only Embossing

H.G.W. (USA)
Hero Glass Works

No Logo
Text only Embossing

HUTA (Poland)
Huta
(Glass Mill)

No Logo
Text only Embossing

 

JEFFREY MFG.CO. (USA)
Jeffrey Manufacturing Company

No Logo
Text only Embossing

JOHNSON & WATSON (USA)
Unknown

No Logo
Text only Embossing

JUMBO (USA)

No Logo
Text only Embossing

 

K (USA)
Unknown

No Logo
Text only Embossing

K.C.G.W. (USA)
King City Glass Works

No Logo
Text only Embossing

KERR (USA)
Kerr Glass Manufacturing

No Logo
Text only Embossing

KIMBLE (USA)
Kimble (Hemingray made)

No Logo
Text only Embossing

KNOWLES (USA)
C. S. Knowles

No Logo
Text only Embossing

 

L.G.T.& CO. (USA)
Luther G. Tillotson Company

No Logo
Text only Embossing

LAWRENCE GRAY (USA)
Lawrence B. Gray

No Logo
Text only Embossing

LEWIS (USA)
Slater Lewis

No Logo
Text only Embossing

L'ELECTRO VERRE (France)
(Electrical Glass)

No Logo
Text only Embossing

LIQUID INSULATOR (USA)

No Logo
Text only Embossing

LOCKE (USA)
Fred M. Locke

No Logo
Text only Embossing

LOWEX (USA)
Low Expansion--Low Expense
(Hemingray Trade Name)

No Logo
Text only Embossing

LYNCHBURG (USA)
Lynchburg Glass Works

Lynchburg Logo (USA)
 

MANHATTAN (USA)
Manhattan Electrical Supply

No Logo
Text only Embossing

MAYDWELL (USA)
Maydwell Glass Co

No Logo
Text only Embossing

MCLAUGHLIN (USA)
William McLaughlin Glass Company

No Logo
Text only Embossing

MCKEE & CO. (USA)
McKee & Company

No Logo
Text only Embossing

MEHR (Iran)
Mehr Glass Factory

MEHR Logo (Iran)

MERSHON (USA)
R.D. Mershon

No Logo
Text only Embossing

M.& E.CO. (USA)
Mayer & Englund Company

No Logo
Text only Embossing

MINCOM (Cuba)
(Unknown)

No Logo
Text only Embossing

MINE INSULATOR (USA)
(Hemingray Product)

No Logo
Text only Embossing

MIVA (Italy)
Manifattura Isolatori Vetro Acqui
(Acqui Glass Insulators Factory)


Manufacture Embossings:
Acoui:
The town in Italy where the Insulators where made
AT: Alta Tensione (High voltage)
BT: Bassa Tensione (low voltage)
CA: Cavo in Alluminio (Cable in Aluminum)
FS: Ferrovie dello Stato (Italian State Railroad Co.)
MT: Media Tensione (medium voltage)
M: (Unknown)
S: (Unknown)
T: (Unknown)
UNES: UNione ESercizi elettrici (old private electric co.)
V: (Unknown)
1xx, 2xx, 3xx series: Seen on Multi Parts, the fist Number is how many parts. for the 1xx it is shaped like a Multipart but is a Unipart (Example the MIVA 1212)

No Logo
Text only Embossing

MONTREAL (Canada)
M.T.CO. (Canada)
Montreal Telegraph Company

No Logo
Text only Embossing

M.T.CO. (Canada)
Montreal Telegraph Company

No Logo
Text only Embossing

 

N DE M (Mexico)
Ferrocarriles Nacionales de Mexico
(National Railways of Mexico)

No Logo
Text only Embossing

N.A.T.Co. (USA)
North American Telegraph Company

No Logo
Text only Embossing

N.E.G.M.CO. (USA)
NEW ENG.TEL.& TEL.CO. (USA)
New England Glass Manufacturing Company

No Logo
Text only Embossing

N.W.& B.I.T.CO. (Canada)
New Westminster & Burrard Inlet Telephone Company

No Logo
Text only Embossing

N.Y.& E.R.R. (USA)
New York & Erie Railroad

No Logo
Text only Embossing

NATIONAL BATTERY CO. (USA)
National Battery Company

No Logo
Text only Embossing

NATIONAL INSULATOR CO. (USA)
National Insulator Company

No Logo
Text only Embossing

 

OAKMAN MFG.CO. (USA)
Oakman Manufacturing Company

No Logo
Text only Embossing

O.V.G.CO. (USA)
Ohio Valley Glass Company

No Logo
Text only Embossing

OWENS ILLINOIS (USA)
Owens Illinois

Owens Illinois Logo (Hemingray Product) (USA)
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