| 1940 JAMES Signal Means Usable By Golf Players |
| 1940 SCOFIELD THEODORE Warning Signal Patent |
| 1940 E H ANDERSON Automotive Signal Patent Print |
| 1940 SPARKS WITHINGTON CO Warning Signal Patent |
| 1940 RUSSELL Electric Signal Toy Railways Patent |
| 1940 A E RITTENHOUSE CO INC Signal Device Patent |
| 1940 LIPP JULIUS Signal Apparatus Patent Print |
| 1940 UNION SWITCH SIGNAL CO Time Measuring Art |
| 1940 SCOFIELD Audible Warning Signal Patent |
| 1940 SPARKS WITHINGTON CO Audible Warning Signal |
| 1940 CLARK Design Splash Guard Signal Tool Patent 48893 |
| 1940 HENRY COLE CO Signal Light Switch Patent |
| 1940 JACKSON Foul Line Signal Bowling Alleys Art |
| 1940 STEVENS Electropneumatic Signal Art Print |
| 1940 WESTINGHOUSE AIR BRAKE CO Electropneumatic Signal |
| 1940 LORD KENNETH Signal Device Patent Print Art |
| 1940 CHARLES AUTH Chime Signal Patent Print Art |
| 1940 ISRAEL Signal Light Switch Control Art |
| 1940 AUTH ELECTRICAL SPECIALTY CO Chime Signal |
| 1940 WALTER RUDOLPH Automobile Signal Patent |
| 1940 SCHULTZ VINTON Automotive Signal Patent |
| 1940 WESTINGHOUSE AIR BRAKE CO Signal Horn Art |
| 1940 JOE Sounding Signal Adjustment Patent Print |
| 1940 SCULLY SIGNAL CO Audible Signaling Use With Tanks |
| 1940 LLOYD RITTENHOUSE Signal Device Patent |
| 1940 FARMER CLYDE Signal Horn Patent Print Art |
| 1940 MAX ZAIGER Signal Light Switch Control Art |
| 1940 LEO MAYER Signal Light Switch Patent Print |
| 1940 GEN MOTORS CORP Sounding Signal Adjustment |
| 1940's PENNY ARCADE Cards US Signal Corps POSTCARD |
| 1940's ANTENNA RELAY UNIT BC-442-A SIGNAL CORPS US ARMY |
| 1940's ANTENNA RELAY UNIT BC-442-A SIGNAL CORPS US ARMY |
| EL CENTRO-1940's Real Photo PC--Canal & Signal Mountain |
| 1940's "NAVY" Christmas card by Hallmark - Signal Flags |
| 1940 Eagle Signal Corp Traffic Light EA Controller Ad |