| 1931 JOSEPH Magnetic Brake For Trains Patent |
| 1931 ANDERSON ROBERT Brake Rigging Patent Print |
| 1931 SCHWENTLER Fluid Pressure Brake Patent |
| 1931 JACKSON Brake Construction Patent Print Art |
| 1931 INT MOTOR CO Brake Rigging Patent Print Art |
| 1931 JOYCE Fluid Brake Mechanism Patent Print |
| 1931 TATUM Brake Shelf For Railroad Cars Patent |
| 1931 O'CONNOR JOHN Hand Brake Patent Print Art |
| 1931 BRODERICK Brake Beam Guard Arm Patent Print |
| 1931 OLSON GEORGE Brake Beam Fulcrum Patent |
| 1931 F A WHITNEY CARRIAGE COMPANY Brake Patent |
| 1931 PIETZSCH Brake Slack Adjuster Patent Print |
| 1931 MINER INC W H Hand Brake Patent Print Art |
| 1931 DORRIS HENRY Car Brake Patent Print Art |
| 1931 PRICE Railway Car Hand Brake Patent Print |
| 1931 HASELTINE STACY Hand Brake Patent Print Art |
| 1931 CRONE Safety Support For Brake Rods Patent |
| 1931 BETHLEHEM STEEL CORP Car Brake Patent Print |
| 1931 O'CONNOR ARTHUR Hand Brake Wheel Patent |
| 1931 ERNST Slidable Block Rail Brake Patent |
| 1931 OLANDER ROLAND Hand Brake Patent Print Art |
| 1931 OLLE OLSON Sled With Brake Patent Print Art |
| 1931 PRICE Hydraulic Band Brake Design Patent 11967 |
| 1931 ERNST Weight Automatic Rail Brake Patent |
| 1931 BOUTIN JOHN Brake For Sleds Patent Print |
| 1931 SAUVAGE Regulator For Brake Rigging Patent |
| 1931 HARRY PERLMUTTER Brake Construction Patent |
| 1931 THOMAS Brake And Door Interlock Patent |