| 1931 WIDDIS Vessel Propelling Means Patent Print |
| 1931 UNION Means Holding Covers In Place Art |
| 1931 BROWN Gate Operating Means Patent Print Art |
| 1931 RUPPERT Rail Locking Means Patent Print Art |
| 1931 MARTIN Transfer Means For Mine Cars Patent |
| 1931 CROSBY Propelling Means Boats Like Art |
| 1931 WALTER Means Lubricating Axle Bearings Journals |
| 1931 LYDA Davit Operating Means Art Print |
| 1931 SINGER CO Work Guiding Means Sewing Machines |
| 1931 SPERRY Means Preventing Pitching Ships Art |
| 1931 INTERNAT DAVIT CORP Davit Operating Means |
| 1931 DICTAPHONE Sound Collecting Transmitting Means |
| 1931 AMERICAN FREIGHT SERVICE INC Locking Means |
| 1931 SMITH Door Holding Means And Release Patent |
| 1931 HEENE GEORGE Marking Means Patent Print Art |
| 1931 LEO Means Shipping Automobile Bodies Art |
| 1931 DAVIDSON Propulsion Means For Boats Patent |
| 1931 ELECTRIC BOAT CO Ferryboat Propelling Means |
| 1931 CLAYBAUGH Vehicle Aligning Elevating Storing Means |
| 1931 SPEAR Ferryboat Propelling Means Patent |
| 1931 WATERS Method Means Producing Pipe Organ Music |
| 1931 EUCLID CRANE HOIST Drawbar Means Art Print |
| 1931 ASEA AB Means Suppressing Vibrations Art |
| 1931 STEVENS Means Locating Sunken Vessels Art |
| 1931 TORALF Life Saving Means For Ships Patent |
| 1931 JOSEPH Means Securing Dishes On Ships' Tables |
| 1931 AUGUST Means Assisting Persons In Swimming Etc |
| 1931 BLACKFORD Means For Trapping Insects Patent |
| 1931 WOODBRIDGE Sound Collecting Transmitting Means |
| 1931 PETRE Means Removing Water From Motor Boats |
| 1931 PERIN DONALD Locking Means Patent Print Art |
| 1931 BUDD EDWARD G CO Means Attaching Upholstery |
| 1931 BARROWS Organ Stop Coupler Actuating Means |
| 1931 ARMINGTON ARTHUR Drawbar Means Patent Print |
| 1931 GREEN Means For Attaching Upholstery Patent |
| 1931 PLATTS Means Securing Freight Containers |
| 1931 ARLE Means Suppressing Vibrations Art Print |
| 1931 KENT Sound Recording Reproducing Means Art |
| 1931 ERIC Means Automatically Removing Water From Boats |
| 1931 BERGEN Means Handling Freight Express Art |
| 1931 SPIRO Packing Box Attaching Means Art Print |
| 1931 SAILER Work Guiding Means Sewing Machines |
| 1931 NAPIER Toy Securing Means Patent Print Art |
| 1931 ELECTRIC Door Holding Means Release Art |
| 1931 TURNER Method Means Watch Regulation Art |
| 1931 MICHAEL Means Extracting Air From Water Art |
| 1931 WOOD Means Detachably Connecting Sails To Spars |
| 1931 CLAUSEN Means Holding Covers In Place Art |
| 1931 GAY Method Means Propelling Ships Art Print |
| 1931 OTTO Synchronizing Means Time Measuring Mechanism |
| 1931 MOEHLER OTTO Support Means Patent Print Art |
| 1931 HILL Means For Eradicating Insects Patent |
| 1931 FLUKER Fastening Means License Plates Like |
| 1931 GEN ELECTRIC VAPOR LAMP CO Support Means |
| 1931 WARREN E POUDER Transfer Means Mine Cars |
| 1931 AUGUST Fretted Instrument Adjusting Means |
| 1931 SERSEN Means Acoustical Correction Art |
| 1931 SUBMARINE SIGNAL CO Method Means Watch Regulation |