| 1940 FRENTZEL Dumping Mechanism Patent Print Art |
| 1940 AMEDEO CONTERIE Control Mechanism Patent |
| 1940 KAYE Selector Control Mechanism Patent |
| 1940 GRIETEN Fishing Reel Mechanism Patent Print |
| 1940 WALTER Chronometric Mechanism Patent Print |
| 1940 FOSTER Time Control Switch Mechanism Patent |
| 1940 WRIGHT WILLIAM Clock Mechanism Patent Print |
| 1940 FRANK Automatic Button Mechanism Patent |
| 1940 FRENTZEL Body Dumping Mechanism Patent |
| 1940 JOHN Electric Clock Mechanism Patent Print |
| 1940 BILGART Electromagnetic Mechanism Patent |
| 1940 LEONARD Switch Operating Mechanism Patent |
| 1940 DENISON FREDERICK Setting Mechanism Patent |
| 1940 DE KRAMOLIN Tuning Mechanism Patent Print |
| 1940 FOLKE CARLSON Shuttle Mechanism Patent |
| 1940 DAY Truck Dumping Mechanism Patent Print |
| 1940 GEDGE Compact Egg Turning Mechanism Patent |
| 1940 OTIS Clock Dial And Mechanism Patent Print |
| 1940 LESLIE Adjustment Mechanism Patent Print |
| 1940 CARL Accordion Shift Mechanism Patent Print |
| 1940 LAMOND Hydraulic Control Mechanism Patent |
| 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 NATHAN Time Indicating Mechanism Patent |
| 1940 SOLINSKI Escapement Mechanism Patent Print |
| 1940 MORRISON VAUGHN Shift Mechanism Patent |
| 1940 MAXON Truck Body Hoist Mechanism Patent |
| 1940 BARRETT Body Hoisting Mechanism Patent |
| 1940 MACNEIL Propeller Control Mechanism Patent |
| 1940 OSGOOD Hoisting Mechanism Patent Print Art |
| 1940 LENEHAN Time Switch Mechanism Patent Print |
| 1940 PHILIP Boat Propelling Mechanism Patent |
| 1940 MASSEY Propelling Mechanism Patent Print |
| 1940 BRINER Propeller Control Mechanism Patent |
| 1940 GEORGE Transmission Mechanism Patent Print |
| 1940 WOODWARD Governor Mechanism Patent Print |
| 1940 EGAN Propeller Driving Mechanism Patent |
| 1940 HEIL CO Dumping Mechanism Patent Print Art |
| 1940 ALFRED Time Measuring Mechanism Patent |
| 1940 WOOD LOUIS Dump Truck Mechanism Patent |
| 1940 BURGESS De Icing Mechanism Patent Print Art |
| 1940 YOUSTON Gear Changing Mechanism Patent |
| 1940 PHILLIPS Stitching Mechanism Patent Print |
| 1940 PUTNAM JOHN Shuttle Mechanism Patent Print |
| 1940 WEIS ALBERT Looper Mechanism Patent Print |
| 1940 HURST Novelty Pendulum Mechanism Patent |
| 1940 BURGESS RICHARD Deicing Mechanism Patent |
| 1940 RALPH Clock Striking Mechanism Patent Print |