| 1940 FRENTZEL Dumping Mechanism Patent Print Art |
| 1940 GRIETEN Fishing Reel Mechanism Patent Print |
| 1940 WALTER Chronometric Mechanism Patent Print |
| 1940 WRIGHT WILLIAM Clock Mechanism Patent Print |
| 1940 JOHN Electric Clock Mechanism Patent Print |
| 1940 DE KRAMOLIN Tuning Mechanism Patent Print |
| 1940 DAY Truck Dumping Mechanism Patent Print |
| 1940 OTIS Clock Dial And Mechanism Patent Print |
| 1940 LESLIE Adjustment Mechanism Patent Print |
| 1940 CARL Accordion Shift Mechanism Patent Print |
| 1940 RALPH By Pass Valve Mechanism Patent Print |
| 1940 CONRAD Oar Operating Mechanism Patent Print |
| 1940 MOORE JOHN Timing Mechanism Patent Print |
| 1940 WURLITZER CO Shift Mechanism Patent Print |
| 1940 SOLINSKI Escapement Mechanism Patent Print |
| 1940 NAT Feed Control Sewing Mechanism Art Print |
| 1940 OSGOOD Hoisting Mechanism Patent Print Art |
| 1940 LENEHAN Time Switch Mechanism Patent Print |
| 1940 MASSEY Propelling Mechanism Patent Print |
| 1940 GEORGE Transmission Mechanism Patent Print |
| 1940 WOODWARD Governor Mechanism Patent Print |
| 1940 HEIL CO Dumping Mechanism Patent Print Art |
| 1940 BURGESS De Icing Mechanism Patent Print Art |
| 1940 PHILLIPS Stitching Mechanism Patent Print |
| 1940 PUTNAM JOHN Shuttle Mechanism Patent Print |
| 1940 WEIS ALBERT Looper Mechanism Patent Print |
| 1940 RALPH Clock Striking Mechanism Patent Print |