| 1941 CLAUDE DORNIER Propeller Blade Patent Print |
| 1941 MILLS Propeller Art |
| 1941 HAMILTON Airplane Propeller Patent Print |
| 1941 DOMINGO CALVO Propeller Patent Print Art |
| 1941 VINCENT Boat Propeller Patent Print Art |
| 1941 BRAUCHLER CHANDIS Propeller Blade Patent |
| 1941 MORRIS WARREN Propeller Drive Patent Print |
| 1941 RUDOLPH Variable Pitch Propeller Patent |
| 1941 CLIFFORD YEWDALL Aeroturbine Propeller Art |
| 1941 DUBBS CARBON Propeller Patent Print Art |
| 1941 PREWITT Propeller Rotor Construction Art |
| 1941 ETTORE BUGATTI Screw Propeller Patent Print |
| 1941 EVEREL PROPELLER CORP Variable Pitch Propeller |
| 1941 EDISON Propeller Patent Print Art |
| 1941 KLOEPFER RICHARD Aerial Propeller Patent |
| 1941 DOMINGO Propeller Patent Print Art |
| 1941 MULLEN MILTON Propeller Patent Print Art |
| 1941 VINCENT JOHN Boat Propeller Patent Print |
| 1941 RUTHS Variable Pitch Propeller Patent Print |
| 1941 ETTORE Propeller Actuated Machine Patent |
| 1941 HAMMOND Variable Pitch Propeller Control |
| 1941 ALBERT RUPP Screw Propeller Patent Print |
| 1941 ETTORE Screw Propeller Patent Print Art |
| 1941 PRIES Weedless Propeller Guard Patent Print |
| 1941 ELOV Ship Propeller Having Rotatable Blades |
| 1941 BENDIX AVIAT CORP Propeller Patent Print |
| 1941 ROLAND Articulated Propeller Patent Print |
| 1941 EVERTS Variable Pitch Propeller Patent |
| 1941 WRIGHT AERONAUTICAL CORP Articulated Propeller |
| 1941 AVIAT CORP Variable Pitch Propeller Art |
| 1941 GATHMANN Aeronautical Propeller Patent |
| 1941 BURNHAM WALTER Propeller Patent Print Art |
| 1941 DORNIER WERKE GMBH Propeller Blade Patent |
| 1941 EDISON GREENE Propeller Patent Print Art |
| 1941 BOCJL CORP Propeller Patent Print Art |
| 1941 RAYMOND Variable Pitch Aerial Propeller Art |
| 1941 VOITH SCHNEIDER PROPELLER COMP Blade Wheel |
| 1941 FREEDMAN BURNHAM ENGINEERING C Propeller |
| 1941 WYMAN GORDON CO Propeller Blade Patent |
| 1941 SMITH Aeronautical Propeller Blade Mounting |
| 1941 WITTEMAN Propeller Stern Bearing Patent |
| 1941 BARTHEL Variable Pitch Propeller Patent |
| 1941 OLIVER Controllable Pitch Propeller Patent |
| 1941 UNITED AIRCRAFT CORP Propeller Aircraft Art |
| 1941 RINDFIEISCH ARTHUR Propeller Patent Print |
| 1941 DICKS Controllable Pitch Propeller Patent |
| 1941 CALDWELL Propeller For Aircraft Patent |
| 1941 FREDERICK BUCKINGHAM Propeller Patent Print |
| 1941 ERLE Propeller Pitch Control Valve Patent |
| 1941 ALBERT Blade Wheel Propeller Patent Print |
| 1941 CURT Variable Pitch Propeller Patent Print |
| 1941 ELBERT HAWKINS Propeller Patent Print Art |
| 1941 DAMERELL MARK Propeller Blade Patent Print |
| 1941 REDLICH Propeller Wheel Steamboats Art |
| 1941 BENJAFIELD Aeroturbine Propeller Patent |
| 1941 GEMENY Variable Pitch Propeller Patent |
| 1941 FRANK WOLF SR Propeller Patent Print Art |
| 1941 HUMPHREY Variable Pitch Propeller Patent |
| 1941 LAMPTON Variable Pitch Propeller Patent |