| 1934 UNION SWITCH SIGNAL CO Railroad Signaling System |
| 1934 UNION SWITCH & SIGNAL CO Relay Patent Print |
| 1934 GEN RAILWAY SIGNAL CO Shock Absorbing Means |
| 1934 PAUL HAASIS Signal Instrument Patent Print |
| 1934 ADLAKE CO Signal Lamp Patent Print Art |
| 1934 UNION SWITCH SIGNAL CO Control Circuits Art |
| 1934 SIGNAL Intermittently Operating Electrical |
| 1934 INTERNAT FLARE SIGNAL Parachute Art Print |
| 1934 SUBMARINE SIGNAL CO Magnetic Steering Indicator |
| 1934 UNION SWITCH SIGNAL CO Speed Responsive |
| 1934 SLAWSON Warning Signal Railway Crossings |
| 1934 SUBMARINE SIGNAL CO Air Oscillator Patent |
| 1934 JEROME Signal Means For Taximeters Patent |
| 1934 ADLER JR Signal Patent Print Art |
| 1934 PALMER Polarized Directional Signal System |
| 1934 HENRY Highway Crossing Signal System Patent |
| 1934 DRIGGS JR Flare Signal Patent Print Art |
| 1934 UNION SWITCH SIGNAL CO Track Circuit System |
| 1934 UNION SWITCH SIGNAL CO Electric Signaling System |
| 1934 GEN RAILWAY SIGNAL CO Railway Track Circuit |
| 1934 ADLER Ornamental Design Signal Patent 49211 |
| 1934 COOPER TAYLOR Signal Switch Patent Print |
| 1934 UNION SWITCH SIGNAL CO Remote Indication |
| 1934 GEN Highway Crossing Signal System Art |
| 1934 LARSON CARL Signal Lamp Patent Print Art |
| 1934 UNION SWITCH SIGNAL CO Railway Switch Controlling |
| 1934 CRANDALL Automobile Signal System Patent |
| 1934 WICK EMIL Signal Clock Patent Print Art |
| 1934 UNION SWITCH SIGNAL CO Electromagnetic Art |
| 1934 SUBMARINE SIGNAL CO Sound Apparatus Patent |
| 1934 HARLAND TYLER Wind Signal Patent Print Art |
| 1934 LOUIS Schedule Signal Clock Patent Print |
| 1934 UNION SWITCH SIGNAL CO Indicating Control |
| 1934 E INGRAHAM COMPANY Signal Clock Patent |
| 1934 GEN RAILWAY SIGNAL CO Car Retarder Railroads |
| 1934 OSCAR Signal For Railway Crossings Patent |
| 1934 UNION SWITCH SIGNAL CO Railway Braking Art |
| 1934 UNION SWITCH SIGNAL CO Railway Signaling |