| 1921 HUMPHREY Automatic Coupling Mine Cars Art |
| 1921 MCCONWAY TORLEY CO Coupling Operating Mechanism |
| 1921 WILLIAM H MINER Coupling Release Mechanism |
| 1921 GEORGE Coupling And Yoke Connection Patent |
| 1921 DUKE Coupling For Mine Cars Patent Print |
| 1921 JOSEPH REIF Car Coupling Patent Print Art |
| 1921 PHILLIPS Automatic Coupling Patent Print |
| 1921 FRANCIS E LING Car Coupling Patent Print |
| 1921 WILLIAM Automatic Coupling Railway Other Vehicles |
| 1921 WILLIAM Coupling Operating Mechanism Patent |
| 1921 TERNES FRANK Car Coupling Patent Print Art |
| 1921 WELLS SR Coupling W D HATFIELD Patent Print |
| 1921 GEORGE Car Coupling Draft Yoke Connection |
| 1921 ALLEN HAYWORTH Car Coupling Patent Print |
| 1921 FORSYTH Train Pipe Coupling Patent Print |
| 1921 CAMPBELL Coupling Release Rigging Patent |
| 1921 ROBERTS Pipe Coupling Railway Rolling Stock |
| 1921 O'CONNOR Coupling Release Mechanism Patent |
| 1921 W D HATFIELD Coupling Patent Print Art |
| 1921 ISAAC MARTIN Mine Car Coupling Patent Print |
| 1921 JOSEPH Coupling Operating Mechanism Patent |
| 1921 MCCONWAY Car Coupling Draft Yoke Connection |
| 1921 MCCONWAY TORLEY CO Coupling Yoke Connection |
| 1921 MURPHY LAWRENCE Car Coupling Patent Print |