| 1929 RYDER Motor Vehicle Signal Patent Print Art |
| 1929 JOSEPH KLIMALA Railway Signal Patent Print |
| 1929 EMANUEL AUFIERO Warning Signal Patent Print |
| 1929 SMITH Railroad Crossing Signal Patent Print |
| 1929 BUCKLEY Signal For Airships Patent Print |
| 1929 BLANKENSHIP CASPER Cab Signal Patent Print |
| 1929 THOMAS Electric Signal System Patent Print |
| 1929 HOWE WINTHROP Light Signal Patent Print Art |
| 1929 DAVIS Railway Crossing Signal Patent Print |
| 1929 EWING Signal Control Apparatus Patent Print |
| 1929 SCOTT Marine Signal Light Patent Print Art |
| 1929 DANIEL HEWITT Highway Signal Patent Print |
| 1929 CAMPBELL CHARLES Signal System Patent Print |
| 1929 ERNST WILCKENS Signal Buoy Patent Print Art |
| 1929 REITZ Railway Crossing Signal Patent Print |
| 1929 YATARO MIYAOKA Car Door Signal Patent Print |
| 1929 ERNST Signal Buoy Patent Print Art |
| 1929 WITHINGTON Diaphragm Signal Patent Print |
| 1929 CASSELL Motor Vehicle Signal Patent Print |
| 1929 MILLER CHARLIE Railway Signal Patent Print |
| 1929 GEORGE ZINT Signal Patent Print Art |
| 1929 WILLIAM JONES Crossing Signal Patent Print |
| 1929 DELCO REMY CORP Sound Signal Patent Print |