| 1923 PECK WILLIAM Signal Patent Print Art |
| 1923 COULOMBE JOSEPH Signal Horn Patent Print |
| 1923 MANTA JOSEPH Crossing Signal Patent Print |
| 1923 HAND ERLE Car Signal Device Patent Print |
| 1923 STORY Illuminated Number Plate Rear Lamp Signal |
| 1923 ATKINSON Railroad Crossing Signal Patent |
| 1923 DANIEL SWEENEY Traffic Signal Patent Print |
| 1923 BOCK Railway Crossing Signal Patent Print |
| 1923 DRISCOLL Time Control Signal System Patent |
| 1923 PUTERBAUGH JOSEPH Signal Patent Print Art |
| 1923 BEMISDERFER Railway Signal Torpedo Patent |
| 1923 SLOAN Railway Signal Lantern Patent Print |
| 1923 HEINRICH Subaqueous Sound Signal Transmitter |
| 1923 CONLEY Signal Flag Support Patent Print Art |
| 1923 ALBERT D MARTIN Stop Signal Crossings Art |
| 1923 FRY Safety Signal For Railway Crossings Art |
| 1923 SANFRED ERICKSON Railway Signal Lantern Art |
| 1923 OLI RUSSELL Railway Signal Patent Print Art |
| 1923 ROY Railroad Crossing Signal Patent Print |
| 1923 CHICAGO RAILWAY SIGNAL SUP Signal Art |
| 1923 JAY COOK Signal Patent Print Art |
| 1923 WESOLOWSKI Automatic Signal Railroad Crossings |
| 1923 STALEY Railway Crossing Signal Patent Print |
| 1923 CENTRAL RAILWAY SIGNAL Railway Signal Torpedo |
| 1923 WILLY Diaphragm Submarine Signal Transmitters |
| 1923 EARL HAYWARD Freight Car Signal Patent |
| 1923 KUHN Railroad Crossing Signal Patent Print |
| 1923 HENRY Signal Device For Road Crossings Art |
| 1923 INTERNAT SIGNAL CO Plunger Shoe Patent |
| 1923 HARRY B KINCAID Traffic Signal Patent Print |
| 1923 WILLIAM Dailway Signal Device Patent Print |
| 1923 HUGHES JAMES Automobile Signal Patent Print |
| 1923 ALEXANDER Railroad Crossing Signal Patent |
| 1923 WANKLYN Railway Track Signal Patent Print |
| 1923 TABOR Stop Signal For Crossings Patent |
| 1923 FERREOL Audible Signal Vibratory Diaphragm Type |
| 1923 KLUG Traffic Signal Casing SMITH Patent 49506 |
| 1923 PITTS Railway Signal Apparatus Patent Print |
| 1923 MILLIKEN Design Street Signal Lamp Patent 49503 |
| 1923 DINSMOOR Audible Signal Device Patent Print |
| 1923 MCCARTHY DANIEL Signal Device Patent Print |
| 1923 LEE Metallic Signal For Locomotives Patent |
| 1923 ZEPKA LUDWIG Theft Signal Patent Print Art |
| 1923 JOHNSON Signal For Road Crossings Patent |
| 1923 DOUGHERTY Railroad Crossing Signal Patent |
| 1923 MAGNETIC SIGNAL CO Coil Cut Out Wigwag Signals |
| 1923 FRANK Railway Signal Torpedo Patent Print |
| 1923 YOUNG Automobile Signal Device Patent Print |
| 1923 WILLIAM Signal For Railroad Crossings Art |
| 1923 SIGNAL ELECTRIC CO Fluid Tight Art Print |
| 1923 BROWN Railway Signal Torpedo Patent Print |
| 1923 DONALDSON STEPHEN Railroad Signal Patent |
| 1923 GIRVIN FITZHUGH Signal Patent Print Art |
| 1923 PENNINGTON Crossing Signal Patent Print Art |
| 1923 GMC School Bus Puente CA Ad Traffic Signal Avery |