| Primary Embossing | Abbreviation | Country |
| A.A. | AA | Mexico |
| A.G.E.E. | AGEE | Australia |
| A.G.M. | AGM | Australia |
| A.T.& T.CO. | ATT | United States |
| A.U. | AU | United States |
| AM.INSULATOR CO. | AMINS | United States |
| AM.TEL.& TEL.CO. | AMTEL | United States |
| ARMSTRONG | ARM | United States |
| AYALA | AYALA | Mexico |
| B | B | United States |
| B & O | B&O | United States |
| B.C.DRIP | BCD | Canada |
| B.E.L.CO. | BEL | United States |
| B.F.G.CO. | BFG | United States |
| B.G.M.CO. | BGM | United States |
| B.T.C. | BTC | Canada |
| BARCLAY | BARC | United States |
| BEAL'S | BEALS | United States |
| BIRMINGHAM | BIRM | United States |
| BOSTON BOTTLE WORKS | BOS | United States |
| BROOKE'S | BRKS | United States |
| BROOKFIELD | BF | United States |
| BUZBY | BUZBY | United States |
| C.& P.TEL.CO. | CP | United States |
| C.C. DE NICARAGUA | CCDEN | Nicaragua |
| C.C.G. | CCG | Australia |
| C.D.& P.TEL.CO. | CDP | United States |
| C.E.L.CO. | CEL | United States |
| C.E.W. | CEW | United States |
| C.G.I.CO. | CGI | United States |
| C.N.R. | CNR | Canada |
| C.P.R. | CPR | Canada |
| C.T.N.E. | CTNE | Spain |
| CABLE | CABLE | United States |
| CAL.ELEC.WORKS | CALEW | United States |
| CALIFORNIA | CAL | United States |
| CANADA | CAN | Canada |
| CANADIAN PACIFIC RY.CO. | CANP | Canada |
| CHAMBERS | CHAMB | United States |
| CHESTER | CHEST | United States |
| CHICAGO INSULATING CO. | CHI | United States |
| CIA COMERCIAL | CIAC | Mexico |
| CIA TELEFONICA | CIAT | Mexico |
| CIN COM | CINCO | Mexico |
| CITY FIRE ALARM | CITY | United States |
| CLIMAX | CLIM | United States |
| COLUMBIA | COL | United States |
| COMBINATION SAFETY | COMB | United States |
| CONVERSE | CONV | United States |
| CRIMSA | CRIM | Mexico |
| CRISA | CRISA | Mexico |
| CRISOL TEXCOCO | CRISO | Mexico |
| CRISTALERIAS DE CHILE | CRDEC | Chile |
| CRISTALERIAS VIDRART | CRIST | Argentina |
| CROWN | CROWN | United States |
| CUTTER | CUT | United States |
| CTC | CTC | Mexico |
| D.T.CO. | DT | Canada |
| DERF | DERF | Mexico |
| DERFLINGHER | DERFL | Mexico |
| DIAMOND | DIAM | Canada |
| DIAMOND P | DIAMP | United States |
| DOMINION | DOM | Canada |
| DRY SPOT INSULATOR | DRY | United States |
| DUPONT | DUP | Canada |
| DUQUESNE | DUQ | United States |
| DWIGHT | DWI | Canada |
| E.C.& M.CO. | ECM | United States |
| E.D.R. | EDR | Canada |
| E.L.CO. | EL | United States |
| E.R. | ER | United States |
| E.R.W. | ERW | United States |
| E.S.A. | ESA | Spain |
| E.S.B.CO. | ESB | United States |
| E.S.G.CO. | ESG | United States |
| E.S.S.CO. | ESS | United States |
| EIV | EIV | French |
| ELECTRICAL SUPPLY CO. | ELECT | United States |
| EMMINGER'S | EMMIN | United States |
| ERICSSON | ERIC | Mexico |
| F.F.C.C.N.DE M. | FFCCN | Mexico |
| FALL RIVER | FALL | United States |
| FIDENZA | FID | Italy |
| FISHER | FISH | United States |
| FLOY | FLOY | United States |
| FLUID INSULATOR | FLUID | United States |
| FOLEMBRAY | FOLEM | French |
| FOSTER | FOS | Canada |
| FT.W.E.CO. | FTWE | United States |
| G.E.CO. | GE | United States |
| G.N.R. | GNR | Canada |
| G.N.W.TEL.CO. | GNW | Canada |
| G.P.R. | GPR | Canada |
| G.T.P.TEL.CO. | GTP | Canada |
| GAYNER | GAY | United States |
| GOOD | GOOD | United States |
| GENERAL ELECTRIC CO. | GENEL | United States |
| GOULD | GOULD | United States |
| GREAT NORTHWESTERN | GNORW | Canada |
| GREELEY | GREEL | United States |
| GREGORY | GREG | United States |
| H.B.R. | HBR | Canada |
| H.G.CO. | HG | United States |
| H.G.W. | HGW | United States |
| HAMILTON | HAM | Canada |
| HARLOE | HAR | United States |
| HAWLEY | HAW | United States |
| HEMINGRAY | HEMI | United States |
| JEFFREY MFG.CO. | JEFF | United States |
| JOHNSON & WATSON | J&W | United States |
| JUMBO | JUMBO | United States |
| K | K | United States |
| K.C.G.W. | KCGW | United States |
| KEELING | KEEL | United States |
| KERR | KERR | United States |
| KIMBLE | KIM | United States |
| KNAPP | KNAPP | United States |
| KNOWLES | KNOWL | United States |
| L'ELECTRO VERRE | LELEC | French |
| L.G.T.& CO. | LGT | United States |
| LAWRENCE GRAY | LGRAY | United States |
| LEFFERTS | LEFF | United States |
| LINEA DEL SUPO | LINEA | Mexico |
| LEWIS | LEWIS | United States |
| LIQUID INSULATOR | LIQ | United States |
| LOCKE | LOCKE | United States |
| LOWEX | LOWEX | United States |
| LYNCHBURG | LYNCH | United States |
| M.& E.CO. | M&E | United States |
| M.T.CO. | MT | Canada |
| MANHATTAN | MAN | United States |
| MAYDWELL | MAYD | United States |
| MCKEE & CO. | MCKEE | United States |
| MCLAUGHLIN | MCL | United States |
| MCMICKING | MCMIC | Canada |
| MERSHON | MERSH | United States |
| MIN COM CUBA | MINCO | United States |
| MINE INSULATOR | MINE | United States |
| MIVA | MIVA | Italy |
| MONTREAL | MONT | Canada |
| MULFORD & BIDDLE | M&B | United States |
| N DE M | NDEM | Mexico |
| N.E.G.M.CO. | NEGM | United States |
| N.W.& B.I.T.CO. | NWBIT | Canada |
| N.Y.& E.R.R. | NYERR | United States |
| NATIONAL BATTERY CO. | NB | United States |
| NATIONAL INSULATOR CO. | NAT | United States |
| NEW ENG.TEL.& TEL.CO. | NET | United States |
| NO EMBOSSING | NE | United States |
| NO EMBOSSING - CANADA | NECAN | Canada |
| NO EMBOSSING - MEXICO | NEMEX | Mexico |
| NO NAME | NN | United States |
| NO NAME - CANADA | NNCAN | Canada |
| NO NAME - MEXICO | NNMEX | Mexico |
| O.V.G.CO. | OVG | United States |
| OAKMAN MFG.CO. | OAK | United States |
| OWENS ILLINOIS | OI | United States |
| P & W | P&W | United States |
| P.F.C. | PFC | French |
| P.L.W. | PLW | United States |
| P.R.R. | PRR | United States |
| P.S.S.A. | PSSA | Mexico |
| PAISLEY | PAIS | United States |
| PAT APP FOR | PATAP | United States |
| PAT'D | PATD | United States |
| PATENT - DEC. 19, 1871 | PTDEC | United States |
| PATENT - OTHER | PTOTH | United States |
| PETTINGELL ANDREWS | PETAN | United States |
| PONY | PONY | United States |
| POSTAL | POST | United States |
| PRISM | PRISM | United States |
| PYREX | PYREX | United States |
| R.Y T. | RYT | Mexico |
| RMV | RMV | Brazil |
| RUIZ | RUIZ | Mexico |
| S.A.F.N.V. | SAFNV | Uruguay |
| S.B.T.& T.CO. | SBT | United States |
| S.F. | SF | United States |
| S.S.& CO. | SS | United States |
| SANTA ANA | SANTA | United States |
| SEDIVER | SED | French |
| SEILERS | SEIL | United States |
| SO EX CO | SOEX | United States |
| SO.MASS.TEL.CO. | SOMA | United States |
| SPAIN | SPAIN | Spain |
| ST.LOUIS MALLEABLE | STLM | United States |
| STANDARD | STAN | United States |
| STANDARD GLASS INSULATOR CO. | STANG | United States |
| STAR | STAR | United States |
| STERLING | STERL | United States |
| SURGE | SURGE | United States |
| T-H. | TH | United States |
| T-H.E.CO. | THE | United States |
| T.C.R. | TCR | Canada |
| TEL.FED.MEX. | TELFM | Mexico |
| TELECOM | TELEC | Columbia |
| TELEGRAFICA | TELGA | Mexico |
| TELEGRAFO | TELGO | Mexico |
| TELEGRAFOS NACIONALES | TELNA | Mexico |
| THAMES GLASS WORKS | TGW | United States |
| TILLOTSON & CO. | TILL | United States |
| TWIGGS | TWIGG | United States |
| TWO PIECE TRANSPOSITION | TWO | United States |
| U.S.L. | USL | United States |
| U.S.LIGHT & HEATING CO. | USLH | United States |
| U.S.TEL.CO. | USTEL | United States |
| V.B. | VB | Mexico |
| V.M.R.NAPOLI | VMR | Italy |
| VERLICA BELGIUM | VERBE | Belgium |
| VI-BO | VI-BO | Columbia |
| VIDRART | VIDRA | Argentina |
| VTS | VTS | United States |
| W.E.MFG.CO. | WEMFG | United States |
| W.F.G.CO. | WFG | United States |
| W.G.M.CO. | WGM | United States |
| W.U. | WU | United States |
| WARE | WARE | United States |
| WESTINGHOUSE | WEST | United States |
| WHITALL TATUM | WT | United States |
| ZICME | ZICME | Columbia |
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Last updated Monday, May 28, 2012