| 1924 RODESS SAMUEL Signal Bell Patent Print Art |
| 1924 LYNDON GRIFFIN Signal Buoy Patent Print Art |
| 1924 WARREN Electric Signal Device Patent Print |
| 1924 SPELLINGS Signal For Railroad Cars Patent |
| 1924 FERGUSSON Toy Semaphore Signal Tower Patent |
| 1924 ENFIELD WILLIAM Warning Signal Patent Print |
| 1924 LYNDON Signal Buoy Patent Print Art |
| 1924 FERGUSSON Toy Signal Tower Patent Print Art |
| 1924 BAY JOHN Bridge Signal Patent Print Art |
| 1924 CARL MARX Theft Signal Patent Print Art |
| 1924 WILEY Railway Signal Torpedo Patent Print |
| 1924 STEWART Signal Lantern Ornamentation Patent 30227 |
| 1924 FRANK Railroad Crossing Signal Patent Print |
| 1924 JANE Railroad Signal And Gate Patent Print |
| 1924 JOSEPH GROSS Bridge Signal Patent Print Art |
| 1924 WADKINS HARVEY Signal Patent Print Art |
| 1924 ATHANASIOS Marine Disaster Signal Patent |
| 1924 GEORGE Railway Signal Switch Patent Print |
| 1924 KARLSON Signal Standard INTERFLASH Patent 49491 |
| 1924 RICHARDS Highway Crossing Signal Patent |
| 1924 JOSEPH BIGGIE Crossing Signal Patent Print |
| 1924 MUNDELL Railway Crossing Signal Patent |
| 1924 WHITTINGTON Stop Signal Lens STEWART Patent 49480 |
| 1924 DOWNS Signal Control Apparatus Patent Print |
| 1924 MANSFIELD WILLIAM Crossing Signal Patent |
| 1924 HENRY C SIX Railroad Signal Patent Print |
| 1924 PARKER Railway Crossing Signal Patent Print |
| 1924 HILLHOUSE WADE Crossing Signal Patent Print |
| 1924 STEVENS Railroad Crossing Signal Patent |
| 1924 RODESS SAMUEL Signal Horn Patent Print Art |
| 1924 BROWN NEIL Water Signal Patent Print Art |
| 1924 FERGUSSON Toy Danger Signal Patent Print |
| 1924 FRY Railway Crossing Signal Patent Print |
| 1924 BURKLEO JOSEPH Crossing Signal Patent Print |
| 1924 SIGNAL GMBH Sound Producer Patent Print Art |
| 1924 MULHOLLAND Floating Signal Bottle Patent 6764 |
| 1924 FRANKLIN Electric Railway Signal Patent |
| 1924 V B PIRCE Crossing Signal Patent Print Art |
| 1924 HURD LAURA Signal Patent Print Art |
| 1924 JOHN Railway Crossing Signal Patent Print |
| 1924 FRANK Railway Signal Torpedo Patent Print |
| 1924 JOHN Railroad Crossing Signal Patent Print |
| 1924 SMITH MELVIN Crossing Signal Patent Print |
| 1924 HARPER Automatic Railroad Signal Patent |
| 1924 OSBORNE JOHN Railroad Signal Patent Print |
| 1924 WEST Railway Crossing Signal Patent Print |
| 1924 SMITH Railroad Crossing Signal Patent Print |
| 1924 SCHIRMER CYRUS Electric Signal Patent Print |