| 1939 MATTHEWS Clamping Mechanism Patent Print |
| 1939 CLARK Cushioning Mechanism Patent Print Art |
| 1939 MRS Striking Mechanism Clocks Art Print |
| 1939 ALLEN Propelling Mechanism Patent Print Art |
| 1939 VICKERS Bomb Release Mechanism Patent Print |
| 1939 ANTHONY INC Tipping Mechanism Art Print |
| 1939 MCNEILL Bomb Release Mechanism Patent Print |
| 1939 FARMER CLYDE Brake Mechanism Patent Print |
| 1939 DE SPAIN Sewing Mechanism Patent Print Art |
| 1939 DAVIS LOYD Steering Mechanism Patent Print |
| 1939 MILLER FRANK Brake Mechanism Patent Print |
| 1939 ENGELHARDT Wing Flap Mechanism Patent Print |
| 1939 LEICESTER Connecting Mechanism Patent Print |
| 1939 RANSOM WILLARD Brake Mechanism Patent Print |
| 1939 WHITNEY RALPH Brake Mechanism Patent Print |
| 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 GRAYSON Time Clock Mechanism Patent Print |
| 1939 ZAP DEV CORP Airfoil Mechanism Patent Print |
| 1939 WELD Warning Signal Mechanism Art Print |
| 1939 ANTHONY CO Tipping Mechanism Patent Print |
| 1939 O'CONNOR Hand Brake Mechanism Patent Print |
| 1939 PFLASTERER Recording Mechanism Patent Print |
| 1939 LADDON Flap Control Mechanism Patent Print |
| 1939 DYNES Time Clock Mechanism Patent Print Art |
| 1939 CONRAD Oar Operating Mechanism Patent Print |