| 1931 DICTAPHONE CORP Control Device Patent Print |
| 1931 PRESTON Marine Salvage Device Patent Print |
| 1931 ANSELME Slack Adjusting Device Patent Print |
| 1931 AULD D L CO Locking Device Patent Print Art |
| 1931 BODINE ALFRED Acoustic Device Patent Print |
| 1931 EVANS EDWARD Anchoring Device Patent Print |
| 1931 LARSEN AXEL Game Device Patent Print Art |
| 1931 ROY FREEMAN Egg Turning Device Patent Print |
| 1931 GEORGE Safety Device For Ships Patent Print |
| 1931 OWENS Toy Talking Movie Device Patent Print |
| 1931 DAGGETT Alarm Sounding Device Patent Print |
| 1931 LOYAL SCOTT Signaling Device Patent Print |
| 1931 JOHN Aquatic Amusement Device Patent Print |
| 1931 HYATT RAYMOND Locking Device Patent Print |
| 1931 HERMAN Gas Discharge Device Patent Print |
| 1931 JOHN Safety Device For Boats Patent Print |
| 1931 PORTER Automatic Timing Device Patent Print |
| 1931 NORTHEY Sound Producing Device Patent Print |
| 1931 CHEVALIER Log Rafting Device Patent Print |
| 1931 HENRI Electrical Timing Device Patent Print |
| 1931 CHANDLER Load Bracing Device Patent Print |
| 1931 BROOKS JOHN Signal Device Patent Print Art |
| 1931 ROSS CHARLES Spring Device Patent Print Art |
| 1931 HALL Lifeboat Launching Device Patent Print |
| 1931 JOHN Toy Or Advertising Device Patent Print |
| 1931 SCOTT DUDLEY Amusement Device Patent Print |
| 1931 HUDD ALFRED Trackway Device Patent Print |
| 1931 ISIDOR WAGNER Game Device Patent Print Art |
| 1931 DAVID HODGE Blasting Device Patent Print |
| 1931 KRAEMER Airport Closure Device Patent Print |
| 1931 JOHNSON ARTHUR Control Device Patent Print |
| 1931 JACKSON Gun Holding Device Patent Print Art |
| 1931 PHILIP BOK Flare Device Patent Print Art |
| 1931 GEIGER EDWARD Program Device Patent Print |
| 1931 ANTWERP Target Throwing Device Patent Print |
| 1931 FRANK Life Preserving Device Patent Print |
| 1931 ROSS Sound Amplifying Device Patent Print |
| 1931 SEARING Stabilizing Device Patent Print Art |
| 1931 SILVIO Railroad Safety Device Patent Print |
| 1931 WILLIAM WOOP Aquatic Device Patent Print |
| 1931 TREMBLAY JOSEPH Packing Device Patent Print |
| 1931 ROCCO Submarine Rescue Device Patent Print |
| 1931 BERT L ADAMS Amusement Device Patent Print |
| 1931 VOLK Golf Practicing Device Patent Print |
| 1931 LOUIS MURNAHAN Marking Device Patent Print |
| 1931 FRANK REBUCK Loading Device Patent Print |
| 1931 SMITH FRANK Amusement Device Patent Print |
| 1931 DOUGLAS Life Saving Device Patent Print Art |
| 1931 DECKER Golf Putting Device Patent Print Art |
| 1931 BYERS Practice Putting Device Patent Print |
| 1931 FOX FREDERICK Amusement Device Patent Print |
| 1931 LA RIZZA Amusement Device Patent Print Art |
| 1931 ZIGTEMA Life Saving Device Patent Print Art |
| 1931 LLEWELLYN Lubricating Device Patent Print |
| 1931 SMITH Automatic Timing Device Patent Print |
| 1931 ELECTRIC BOAT CO Safety Device Patent Print |
| 1931 BERT Clock Resetting Device Patent Print |
| 1931 CASE Golf Ball Cleaning Device Patent Print |
| 1931 ALFRED COPONY Decking Device Patent Print |
| 1931 HENRY Stage Display Device Patent Print Art |
| 1931 ALLEN Arrow Testing Device Patent Print Art |
| 1931 DOVER SAMUEL Signaling Device Patent Print |
| 1931 LLEWELLYN Amusement Device Patent Print Art |
| 1931 FAIRCHILD Body Locking Device Patent Print |
| 1931 ANDERSON HARRY Locking Device Patent Print |
| 1931 JOHNSON Sound Receiving Device Patent Print |
| 1931 SNYDER CLIFFORD Decking Device Patent Print |
| 1931 BLEECKER Well Shooting Device Patent Print |
| 1931 REEVE SIDNEY Swimming Device Patent Print |
| 1931 LOUIS COLELLA Riding Device Patent Print |
| 1931 MCCOY HARRY Exercising Device Patent Print |
| 1931 PETER Inflatable Safety Device Patent Print |
| 1931 KYLE NICHOLAS Hoisting Device Patent Print |
| 1931 JACOBI EDWARD Locking Device Patent Print |
| 1931 MEEHAN JAMES Amusement Device Patent Print |
| 1931 NORVIEL HARRY Antitheft Device Patent Print |
| 1931 PLATT HARRY Signaling Device Patent Print |