| 1920 SINGER Mechanism Clipping Holes In Sheet Material |
| 1920 OSTROWSKI Striking Mechanism Time Clocks |
| 1920 TREVOR Lock Mechanism Of Ordnance Patent |
| 1920 VICKERS LTD Firing Mechanism Ordnance Art |
| 1920 HART Door Operating Mechanism Patent 8801 |
| 1920 NILS AALL KRAG Locking Mechanism Switch Points |
| 1920 CURTIS Bolting Mechanism For Guns Patent |
| 1920 WATTS Steering Mechanism Aeroplanes Art |
| 1920 SETTLAGE Dumping Mechanism Trucks Like Art |
| 1920 PEOPLES Adjusting Mechanism Propeller Blades |
| 1920 AMERICAN BALSA INC Mechanism Turning Ships' Davits |
| 1920 NILS Locking Mechanism Switch Points Art |
| 1920 STUPAR Driving Mechanism Flying Machines |
| 1920 AXEL Mechanism Turning Ships' Davits Art |
| 1920 AUTOMOTIVE Speed Controlling Mechanism Automobiles |
| 1920 MILLER Trigger Mechanism Safety Art Print |
| 1920 TREVOR Breech Mechanism Of Ordnance Patent |
| 1920 HUBBARD Mechanism Adjusting Propreller Pitch |
| 1920 SETTLAGE Dumping Mechanism Trucks Art Print |
| 1920 AUGUST Hand Operated Power Mechanism Small Boats |