| 1920 SENDERLING Hoisting Mechanism Patent Print |
| 1920 HULDER Player Piano Mechanism Patent Print |
| 1920 WILLIAM Rope Teasing Mechanism Patent Print |
| 1920 AKERLUND Controller Mechanism Patent Print |
| 1920 O'CONNOR JOHN Brake Mechanism Patent Print |
| 1920 MERT COWEN Switch Mechanism Patent Print |
| 1920 SIMONS Propelling Mechanism Patent Print |
| 1920 ELI Propelling Mechanism Patent Print Art |
| 1920 HILL GEORGE Take Up Mechanism Patent Print |
| 1920 PEYCKE ARMAND Brake Mechanism Patent Print |
| 1920 ENTPR Door Operating Mechanism Art Print |
| 1920 STAMBAUGH Breech Mechanism Patent Print Art |
| 1920 WASHBURN EDWIN Draft Mechanism Patent Print |
| 1920 ZWARICH Spring Drive Mechanism Patent Print |
| 1920 REECE Driving Stopping Mechanism Art Print |
| 1920 HAM THOMAS Brake Mechanism Patent Print Art |
| 1920 BARRETT Pin Setting Mechanism Patent Print |
| 1920 PAYNE OSCAR Gun Mechanism Patent Print Art |
| 1920 MILLER Trigger Mechanism Safety Art Print |
| 1920 ACKLEY GRIFFIN Brake Mechanism Patent Print |
| 1920 ENOS SALSICH Switch Mechanism Patent Print |
| 1920 DOERR HARRY Draft Mechanism Patent Print |
| 1920 SETTLAGE Dumping Mechanism Trucks Art Print |
| 1920 OLSEN Pin Setting Mechanism Patent Print |
| 1920 ALMONT Propulsion Mechanism Patent Print |
| 1920 NEIKIRK JOHN Draft Mechanism Patent Print |
| 1920 HUGG Dumping Mechanism Autotrucks Art Print |
| 1920 FRANK Driving Mechanism Airplanes Art Print |