| 1939 MATTHEWS Clamping Mechanism Patent Print |
| 1939 DE Sewing Machine Feeding Mechanism Patent |
| 1939 RIFAT AVIGDOR Control Mechanism Patent |
| 1939 CLARK Cushioning Mechanism Patent Print Art |
| 1939 ALLEN Propelling Mechanism Patent Print Art |
| 1939 ZWACK Rotation Control Mechanism Patent |
| 1939 VICKERS Bomb Release Mechanism Patent Print |
| 1939 KAYE Selector Control Mechanism Patent |
| 1939 SATE Hand Brake Holding Mechanism Patent |
| 1939 MCNEILL Bomb Release Mechanism Patent Print |
| 1939 HALL Motorboat Driving Mechanism Patent |
| 1939 FARMER CLYDE Brake Mechanism Patent Print |
| 1939 DE SPAIN Sewing Mechanism Patent Print Art |
| 1939 ANTHONY WILLIAM Tipping Mechanism Patent |
| 1939 DAVIS LOYD Steering Mechanism Patent Print |
| 1939 MILLER FRANK Brake Mechanism Patent Print |
| 1939 AUSTIN Propeller Control Mechanism Patent |
| 1939 ERLE Hydraulic Control Mechanism Patent |
| 1939 ENGELHARDT Wing Flap Mechanism Patent Print |
| 1939 HEITNER Shock Absorbing Mechanism Patent |
| 1939 LEICESTER Connecting Mechanism Patent Print |
| 1939 LUDWIG Timing Switch And Mechanism Patent |
| 1939 RANSOM WILLARD Brake Mechanism Patent Print |
| 1939 WHITNEY RALPH Brake Mechanism Patent Print |
| 1939 LESTER WACHTER Tipping Mechanism Patent |
| 1939 RAYMOND WASEIGE Driving Mechanism Patent |
| 1939 FRED Brake Mechanism For Sleds Patent Print |
| 1939 UNION Hand Brake Mechanism Art Print Patent |
| 1939 MUSSEY Cushioning Mechanism Patent Print |
| 1939 GREER Door Operating Mechanism Patent Print |
| 1939 JOHNSON Shock Absorbing Mechanism Patent |
| 1939 ERNEST Needle Lubricating Mechanism Patent |
| 1939 GRAYSON Time Clock Mechanism Patent Print |
| 1939 MUSSELMAN Speed Control Mechanism Patent |
| 1939 ZAP DEV CORP Airfoil Mechanism Patent Print |
| 1939 SHIPMAN CLARENCE Clutch Mechanism Patent |
| 1939 ANTHONY CO Tipping Mechanism Patent Print |
| 1939 O'CONNOR Hand Brake Mechanism Patent Print |
| 1939 CLAVES Striking Mechanism For Clocks Patent |
| 1939 GLACY Driving Mechanism For Cycles Patent |
| 1939 DELAVAL Driving Mechanism For Cycles Patent |
| 1939 PFLASTERER Recording Mechanism Patent Print |
| 1939 LADDON Flap Control Mechanism Patent Print |
| 1939 AIR EQUIPMENT SA Driving Mechanism Patent |
| 1939 DRAKE Rail Flaw Detector Mechanism Patent |
| 1939 DYNES Time Clock Mechanism Patent Print Art |
| 1939 BARRETT Body Hoisting Mechanism Patent |
| 1939 ZAPARKA EDWARD Airfoil Mechanism Patent |
| 1939 CONRAD Oar Operating Mechanism Patent Print |