| 1931 BRIGGS & STRATTON CORP Switch Patent Print |
| 1931 FAIRCHILD LOCK CORP Locking Reminder Patent |
| 1931 DICTAPHONE CORP Control Device Patent Print |
| 1931 B B & R KNIGHT CORP Cloth Holder Patent |
| 1931 GREAT LAKES GOLF CORP Golf Club Patent |
| 1931 PULLMAN CAR AND MFG CORP Car Window Patent |
| 1931 SILUNTKADDI CORP Golf Bag Patent Print Art |
| 1931 PULLMAN CAR & MFG CORP Railway Car Patent |
| 1931 WHITING CORP Drop Pit Patent Print Art |
| 1931 DELCO REMY CORP Sound Signal Patent Print |
| 1931 AMERICAN PIANO CORP Valve Unit Patent Print |
| 1931 ORLOW PRODUCTS CORP DE Skate Patent Print |
| 1931 DELCO REMY CORP Switch Patent Print Art |
| 1931 RAMAPO AJAX CORP Switch Stand Patent Print |
| 1931 RAMAPO AJAX CORP Lamp Tip Patent Print Art |
| 1931 WELIN DAVIT & BOAT CORP Life Float Patent |
| 1931 FAIRCHILD LOCK CORP Gas Lock Patent Print |
| 1931 CHRYSLER CORP Trunk Rack Patent Print Art |
| 1931 AUTO ORDNANCE CORP Firearm Patent Print Art |
| 1931 GEN MOTORS CORP Loading Equipment Patent |
| 1931 OUTBOARD MOTORS CORP Motor Support Patent |
| 1931 HICKS HARLIE Bumper GEN MOTORS CORP Patent |
| 1931 DICTAPHONE CORP Acoustic Device Patent |
| 1931 FAIRCHILD LOCK CORP Two Hand Lock Patent |
| 1931 ROGERS BROTHERS CORP Truck Patent Print Art |
| 1931 DILCAP CORP License Plate Clamp Patent |
| 1931 MOTOR PRODUCTS CORP Garnish Molding Patent |
| 1931 TRICO PRODUCTS CORP Horn Patent Print Art |
| 1931 BRIGGS & STRATTON CORP Lock Patent Print |
| 1931 DELCO REMY CORP Coincidental Lock Patent |
| 1931 AMERICAN HARDWARE CORP Lock Patent Print |
| 1931 IVES CORP Toy Bogie Truck Patent Print Art |
| 1931 BETHLEHEM STEEL CORP Car Brake Patent Print |
| 1931 DELCO REMY CORP Antitheft Device Patent |
| 1931 OAKES PRODUCTS CORP Vise Grip Lock Patent |
| 1931 OAKES PRODUCTS CORP Indicator Patent Print |
| 1931 DELCO REMY CORP Electric Switch Patent |
| 1931 GEN MOTORS CORP Bumper Patent Print Art |
| 1931 SKIBOARD CORP Motor Surf Board Patent Print |
| 1931 RCA CORP Air Driven Tuning Fork Patent |
| 1931 LIONEL CORP Electrical Toy Patent Print Art |
| 1931 UNIVERSAL TOY CORP Vehicle Patent Print Art |
| 1931 OWNAME PRODUCTS CORP Tee Caddy Patent Print |
| 1931 GEN AMERICAN TANK CAR CORP Tank Car Patent |