| 1931 WINKLER Salvaging Sunken Ships Art Print |
| 1931 KERWIN Indicator Buoy Sunken Ships Art |
| 1931 GEORGE Safety Device For Ships Patent Print |
| 1931 ADAIR Propulsion Multiple Screw Ships Art |
| 1931 SCHEIN Roll Pitch Reducing Ships Art Print |
| 1931 SPERRY Means Preventing Pitching Ships Art |
| 1931 JAMES Hatch Cover For Ships Patent Print |
| 1931 MACGREGOR KING LTD Steel Hatch Cover Ships |
| 1931 DRAG ELIMINATOR INC Drag Eliminator Ships |
| 1931 ROBERT Steel Hatch Cover For Ships Patent |
| 1931 ANNA EMILIA OERTZ Hollow Rudder Ships Art |
| 1931 SPERRY GYROSCOPE INC Roll Pitch Reducing Ships |
| 1931 PIETER Winding Fall Ships' Life Boats Art |
| 1931 JACOB Method Determining Center Gravity Ships |
| 1931 VLADIMIR Trace Of Ships' Lines Patent Print |
| 1931 TORALF Life Saving Means For Ships Patent |
| 1931 JOSEPH Means Securing Dishes On Ships' Tables |
| 1931 JOHANNES Contrivance Stowing Cargo On Ships |
| 1931 GEN ELECTRIC Propulsion Multiple Screw Ships |
| 1931 SAMUEL Drag Eliminator For Ships Patent |
| 1931 RUDOLF Construction Ships Boats Like Art |
| 1931 OSCAR Rudder Arrangement For Ships Patent |
| 1931 JOSCELYN Hull Structure Ships Like Art |
| 1931 EMILIA Hollow Rudder For Ships Patent Print |
| 1931 VICTOR Re Floating Of Stranded Ships Patent |
| 1931 GAY Method Means Propelling Ships Art Print |
| 1931 TELLEFSEN Outrigger Davit For Ships Patent |
| 1931 BUCHANAN Hatch For Ships And Boats Patent |
| 1931 THOMAS Construction Ships Other Structures |
| ALGERIA 1931 Postcard Harbour Boats Ships General View |