| 1941 FRANCIS G CHASE Remote Signal Control Art |
| 1941 LLOYD RITTENHOUSE Chime Signal Patent Print |
| 1941 SPARKS WITHINGTON CO Warning Signal Patent |
| 1941 UNION SWITCH SIGNAL CO Railway Braking Art |
| 1941 UNION SWITCH SIGNAL CO Railway Signaling System |
| 1941 A E RITTENHOUSE CO INC Chime Signal Patent |
| 1941 A E RITTENHOUSE CO INC Signal Device Patent |
| 1941 SCOFIELD THEODERE Warning Signal Patent |
| 1941 WARREN GLENN Signal Device Patent Print Art |
| 1941 GEORGE GOTZINGER Mirror Signal Patent Print |
| 1941 ELLERY Warning Signal Motor Vehicles Art |
| 1941 GEN MOTORS CORP Signal Switch Patent Print |
| 1941 NEWMAN Remote Signal Control Art Print |
| 1941 UNION SWITCH SIGNAL CO Railway Track Circuit |
| 1941 UNION SWITCH SIGNAL CO Track Circuit Art |
| 1941 BLUEMLE ARNOLD Signal Switch Patent Print |
| 1941 LEASON TAYLOR Hand Brake Signal Patent |
| 1941 UNION SWITCH SIGNAL CO Railway Signaling |
| 1941 PERSONS HENRY Theft Signal Patent Print Art |
| 1941 RIEDMAIER Emergency Brake Signal Patent |
| 1941 GAMEWELL Warning Signal Mechanism Art |
| 1941 SNOVER WILLIAM Hand Brake Signal Patent |
| 1941 SUBMARINE SIGNAL CO Preventing Erosion Metals |
| 1941 AUGUST HUMMEL Signal Pistol Patent Print |
| 1941 UNION SWITCH SIGNAL CO Control Art Print |
| 1941 CARVER Reflective Road Signal Patent 9417 |
| 1941 UNION SWITCH SIGNAL CO Electrical Control |
| 1941 UNION SWITCH SIGNAL CO Remote Control System |
| 1941 LINK Signal Controlling Means Patent Print |
| 1941 WELD Warning Signal Mechanism Art Print |
| 1941 LLOYD RITTENHOUSE Signal Device Patent |
| 1941 BLODGETT Switch For Signal Lights Patent |
| VINTAGE*ELECTRIC FAN*1941 SIGNAL w/Cast Iron Base Works |