Glass Insulator Markings

Markings (Country)
Meaning of markings

Logo
If applicable


A.A. (Mexico)
Unknown

A.A. Logo

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

No Logo
Text only Embossing


A.G.M. (Australian)
Australian Glass Manufacture

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

AYALA (Mexico)
Unknown

AYALA Logo

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)

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

DIAMOND P (USA)

Diamond P

DOMINION (Canada)

Dominion Logo

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

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

No Logo
Text only Embossing


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

No Logo
Text only Embossing


H.G.W. (USA)
Houston 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)

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

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

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

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