| 1938 MURPHY Pin Spotting Mechanism Patent Print |
| 1938 KNIGHT Walk Over Seat Mechanism Patent |
| 1938 HOKE HARRY Brake Mechanism Patent Print Art |
| 1938 EISENBERG Hoisting Mechanism Patent Print |
| 1938 HODGMAN Mechanical Servo Mechanism Patent |
| 1938 GWINN Aircraft Wheel Mechanism Patent Print |
| 1938 MCNICOLL Starting Mechanism Patent Print |
| 1938 MUELLER EMIL Brake Mechanism Patent Print |
| 1938 GANTNER WILLIAM Brake Mechanism Patent |
| 1938 HEIL CO Hoisting Mechanism Patent Print Art |
| 1938 IVAN Electric Clock Mechanism Patent Print |
| 1938 DRAKE Rail Flaw Detector Mechanism Patent |
| 1938 HAND Sewing Machine Mechanism Patent Print |
| 1938 BOYLE JAMES Valve Mechanism Patent Print |
| 1938 SMITH HENRY Brake Mechanism Patent Print |
| 1938 ANTHONY WILLIAM Tipping Mechanism Patent |
| 1938 PERRY Track Recorder Mechanism Patent Print |
| 1938 ANTHONY CO Tipping Mechanism Patent Print |
| 1938 OLANDER Quick Take Up Mechanism Patent |
| 1938 KENYON Aeroplane Control Mechanism Patent |
| 1938 AMERICAN BRAKE CO Brake Mechanism Patent |
| 1938 CLARK Cushioning Mechanism Patent Print Art |
| 1938 JOSEPH SAUERLAND Piano Mechanism Patent |
| 1938 CARL Accordion Shift Mechanism Patent Print |