| 1920 GREENLEAF WILLIAM Locking Device Patent |
| 1920 WELLER Locking Internal Combustion Engines |
| 1920 LINDEN JOHN Locking Device Patent Print Art |
| 1920 YUSKE Locking Device For Levers Patent |
| 1920 EARL Locking Motor Vehicles Art Print |
| 1920 NORTON Automobile Locking Device Patent |
| 1920 MECHANICS MACHINE Automobile Locking Art |
| 1920 LEVIN Automobile Locking Device Patent |
| 1920 CORNING HENRY Locking Mechanism Patent |
| 1920 FAYETTE HENDRICKS Locking Device Patent |
| 1920 FAYETTE Auto Safety Locking Device Patent |
| 1920 FELLER Automobile Locking Device Patent |
| 1920 NILS AALL KRAG Locking Mechanism Switch Points |
| 1920 CONNECTICUT ELECTRIC CLOCK CO Locking Art |
| 1920 SHEARER Torpedo Boat Locking Launching Mechanism |
| 1920 SYNSTELIEN Combined Locking Lifting Truck Bodies |
| 1920 GERAGHTY Locking Automobiles Art Print |
| 1920 JULIUS Locking Motor Vehicles Art Print |
| 1920 OLSEN Locking Automobile Hand Control Levers |
| 1920 NILS Locking Mechanism Switch Points Art |
| 1920 RANDOLPH Motor Car Locking Device Patent |
| 1920 VINCENT Locking Steering Wheel Patent Print |
| 1920 ZINK Means For Locking Automobiles Patent |
| 1920 MILLER Locking Steering Wheels Art Print |
| 1920 AUGUST Locking Means For Automobiles Patent |
| 1920 NICHOLS Locking Mechanism Motor Vehicles |
| 1920 HEADLEY Locking Attachment Patent Print Art |
| 1920 READ Locking Device For Automobiles Patent |
| 1920 WATERBURY CLOCK CO Locking Device Patent |
| 1920 SMITH Locking Automobile Steering Knuckle Arms |
| 1920 H M COVEY Locking Automobile Hand Control Levers |
| 1920 GERRIT Locking Releasing Boat Tackles Art |
| 1920 TRIPP Sparker Cutting Out Locking Art |
| 1920 RIGBY Locking Device Transportation Patent 22122 |
| 1920 WINCHESTER Locking Steering Wheels Art |
| 1920 MARTIN Automatically Locking Switch Stand |