| 1920 JAMES Electric Guiding Mechanism Patent |
| 1920 ARGYLE Car Door Operating Mechanism Patent |
| 1920 ARGYLE Door Operating Mechanism Patent |
| 1920 SENDERLING Hoisting Mechanism Patent Print |
| 1920 HULDER Player Piano Mechanism Patent Print |
| 1920 CORNING HENRY Locking Mechanism Patent |
| 1920 WILLIAM H MINER Brake Mechanism Patent |
| 1920 WILLIAM Rope Teasing Mechanism Patent Print |
| 1920 SCULLIN STEEL CO Draft Mechanism Patent |
| 1920 TREVOR Lock Mechanism Of Ordnance Patent |
| 1920 AKERLUND Controller Mechanism Patent Print |
| 1920 HART Door Operating Mechanism Patent 8801 |
| 1920 O'CONNOR JOHN Brake Mechanism Patent Print |
| 1920 MERT COWEN Switch Mechanism Patent Print |
| 1920 SIMONS Propelling Mechanism Patent Print |
| 1920 COSEY Switch Operating Mechanism Patent |
| 1920 CURTIS Bolting Mechanism For Guns Patent |
| 1920 FREDERICK Craft Propulsion Mechanism Patent |
| 1920 TREVOR Ordnance Firing Mechanism Patent |
| 1920 ELI Propelling Mechanism Patent Print Art |
| 1920 HILL GEORGE Take Up Mechanism Patent Print |
| 1920 PEYCKE ARMAND Brake Mechanism Patent Print |
| 1920 ELI SPITLER Propelling Mechanism Patent |
| 1920 G S ACKLEY & CO Brake Mechanism Patent |
| 1920 JANE Hoisting And Loading Mechanism Patent |
| 1920 JOHN Driving And Stopping Mechanism Patent |
| 1920 FOREST Thread Controlling Mechanism Patent |
| 1920 TREVOR Firing Mechanism Of Ordnance Patent |
| 1920 DENNIS F CASEY Switch Mechanism Patent |
| 1920 DUNCAN Bass Drum Operating Mechanism Patent |
| 1920 STAMBAUGH Breech Mechanism Patent Print Art |
| 1920 HORTON Mail Bag Transfer Mechanism Patent |
| 1920 WASHBURN EDWIN Draft Mechanism Patent Print |
| 1920 ZWARICH Spring Drive Mechanism Patent Print |
| 1920 HAM THOMAS Brake Mechanism Patent Print Art |
| 1920 JOHN MCMANUS Train Stop Mechanism Patent |
| 1920 HENRY Aeroplane Control Mechanism Patent |
| 1920 BARRETT Pin Setting Mechanism Patent Print |
| 1920 KIRKHAM CHARLES Control Mechanism Patent |
| 1920 PAYNE OSCAR Gun Mechanism Patent Print Art |
| 1920 WESLEY Clock Striking Mechanism Patent |
| 1920 AUTO ORDNANCE CORP Gun Mechanism Patent |
| 1920 ACKLEY GRIFFIN Brake Mechanism Patent Print |
| 1920 BONNER JOSEPH Dumping Mechanism Patent |
| 1920 ENOS SALSICH Switch Mechanism Patent Print |
| 1920 DOERR HARRY Draft Mechanism Patent Print |
| 1920 STODDARD Bomb Dropping Mechanism Patent |
| 1920 TREVOR Breech Mechanism Of Ordnance Patent |
| 1920 DANIEL Pedal Operated Mechanism Patent |
| 1920 TREVOR Ordnance Breech Mechanism Patent |
| 1920 OLSEN Pin Setting Mechanism Patent Print |
| 1920 ALMONT Propulsion Mechanism Patent Print |
| 1920 KINNE EDMUND Coupling Mechanism Patent |
| 1920 NEIKIRK JOHN Draft Mechanism Patent Print |
| 1920 BUHOUP Coupling Centering Mechanism Patent |