| 1929 DAYTON Automobile Locking Mechanism Patent |
| 1929 WALTER Locking Steering Wheels Motor Cars |
| 1929 CAMILLE Locking Automobiles Art Print |
| 1929 PINKERTON Automobile Locking Device Patent |
| 1929 ZELIE Combination Locking Mechanism Vehicles |
| 1929 PACKARD MOTOR CAR CO Locking Mechanism Art |
| 1929 MINER Center Pin Locking Arrangement Railway Cars |
| 1929 JOHN F DALY WILLIAM DONAHUE Locking Art |
| 1929 GILLEN Locking Mechanism Motor Vehicles Art |
| 1929 WOOD Locking Mechanism Dumping Bodies Art |
| 1929 ALBERT Locking Motor Vehicles Art Print |
| 1929 CREMEAN Door Locking Mechanism Patent Print |
| 1929 LUCKY Railroad Switch Locking Mechanism Art |
| 1929 GEORGE Helm Locking Vessels Art Print |
| 1929 COLBY Switch Locking Mechanism Patent Print |
| 1929 JOHNSON Transmission Housing Cover Locking Means |
| 1929 JOHNSON Transmission Cover Locking Means |
| 1929 KENWORTHY ROBERT Locking Device Patent |
| 1929 SCOTCHER Carton Locking S.C.S BOX Patent 20233 |
| 1929 O'CONNOR Locking Center Pin Railway Cars |
| 1929 MINER Locking Center Pin Construction Railway Cars |
| 1929 MAVES Switch Point Locking Device Patent |
| 1929 GEORGES Locking Automobiles Art Print |
| 1929 MINER W H Locking Center Pin Railway Cars |
| 1929 MILTON TIBBETTS Locking Mechanism Patent |
| 1929 ROBERT Railway Signal Locking Device Patent |