| 1930 POLLAK MFG COMPANY Cowl Construction Patent |
| 1930 JAKOB Amusement Car Construction Patent |
| 1930 LOEFFEL Corset Construction Patent Print |
| 1930 MINER WILLIAM Car Construction Patent Print |
| 1930 COE Railway Car Runway Construction Patent |
| 1930 SISSON Railway Car Construction Patent |
| 1930 ROCKWELL Airplane Construction Patent Print |
| 1930 PIGGOTT Aircraft Construction Patent Print |
| 1930 ENDTER Airplane Construction Patent Print |
| 1930 O'CONNOR JOHN Car Construction Patent Print |
| 1930 O C DURYEA CORP Car Construction Patent |
| 1930 POWIS Aircraft Construction Patent Print |
| 1930 MURPHY Railway Car Construction Patent |
| 1930 CAYO CLARENCE Switch Construction Patent |
| 1930 MORGAN CONSTRUCTION CO Bumper Patent Print |
| 1930 MURRAY OHIO Toy Construction Patent Print |
| 1930 CARL SCHLESINGER Cowl Construction Patent |
| 1930 GRIESHABER Hatch Construction Patent Print |
| 1930 JOHNSON GEORGE Car Construction Patent |
| 1930 MICHAEL Aeroplane Construction Patent Print |
| 1930 HALL ELBERT Car Construction Patent Print |
| 1930 LEON UNDERWOOD Vehicle Construction Patent |
| 1930 GILBERT CO A C Construction Toy Patent |
| 1930 FRANKLIN Aeroplane Construction Patent |
| 1930 GILBERT Toy Building Construction Patent |
| 1930 DALTON Aerofoil Construction Patent Print |
| 1930 SCHMECK Track Construction Patent Print Art |
| 1930 BOORMAN Golf Club Head Construction Patent |
| 1930 GRAMM Boat Construction Patent Print Art |
| 1930 GRAMM FRANK Boat Construction Patent Print |
| 1930 THORALF Airplane Construction Patent Print |
| 1930 GILPIN Railway Car Construction Patent |
| 1930 HOORN Boat Construction Patent Print Art |
| 1930 DIETRICHSON Car Construction Patent Print |
| 1930 LEHMAN EDWARD Car Construction Patent Print |
| 1930 GOSNER Aircraft Construction Patent Print |
| 1930 CROSS Aeroplane Wing Construction Patent |
| 1930 SEMMES Airfoil Construction Patent Print |
| 1930 TUCKER MAX Block Construction Patent Print |
| 1930 ELECTRIC BOAT CO Hatch Construction Patent |
| 1930 GILBERT Construction Toy Patent Print Art |
| 1930 HASELTINE Car Construction Patent Print Art |
| 1930 DILL Flange Joint Construction Patent 45232 |
| 1930 COUTANT GEORGE Car Construction Patent |
| 1930 SCHMOHL ALFRED Car Construction Patent |
| 1930 WING LUMAN Piano Construction Patent Print |
| 1930 MINER INC W H Car Construction Patent Print |
| 1930 KNOELL Sleeping Car Construction Patent |
| 1930 BELL Aircraft Construction Patent Print Art |
| 1930 GREENING Boat Hull Construction Patent |
| 1930 LEACH COMPANY Pike Construction Patent |
| 1930 JANDUS Bumper Construction Patent Print Art |
| 1930 OLANDER ROLAND Car Construction Patent |
| 1930 DURYEA OTHO Car Construction Patent Print |
| 1930 MONTEITH Vehicle Bumper Construction Patent |
| 1930 ERNEST Airship Construction Patent Print |
| 1930 TOM Airplane Wing Construction Patent Print |
| 1930 KRAEFT Sheet Metal Toy Construction Patent |
| 1930 GEIGER WILLIAM Car Construction Patent |
| 1930 JAMES Stream Line Construction Patent Print |
| 1930 ORR Six Wheel Truck Construction Patent |