| 1949 ROUSE Adjustable Pitch Propeller Patent |
| 1927 MICHAEL Adjustable Propeller Aeroplanes Art |
| 1937 CORRADINO Adjustable Propeller Patent Print |
| 1921 EDWIN Adjustable Propeller Blade Patent |
| 1922 FREDERICK Adjustable Pitch Propeller Patent |
| 1923 ERWIN Adjustable Propeller Nave Patent |
| 1948 HARDY Adjustable Pitch Propeller Patent |
| 1942 ASHELMAN Automatic Adjustable Propeller Art |
| 1938 EVERTS Adjustable Propeller Patent Print |
| 1937 PIAGGIO & CO Adjustable Propeller Patent |
| 1934 HEBBARD Adjustable Propeller Patent Print |
| 1938 EVEREL PRODUCTS CORP Adjustable Propeller |
| 1936 ERNEST Adjustable Pitch Propeller Patent |
| 1940 CARL Adjustable Screw Propeller Patent |
| 1951 T M K CORP Adjustable Propeller Patent |
| 1942 GODFREY Adjustable Pitch Propeller Patent |
| 1922 ERWIN Adjustable Self Regulating Propeller |
| 1956 GASTON Hub Mounting An Adjustable Pitch Propeller |
| 1934 ARTHUR Adjustable Propeller Patent Print |
| 1965 EDWARDS Adjustable Height Propeller Drive Assembly |
| 1921 AMERICAN AERO Adjustable Propeller Blade |
| 1937 ERNEST Adjustable Pitch Propeller Patent |
| 1922 SCHMIDT Adjustable Metallic Air Propeller |
| 1922 SETH Adjustable Reversible Propeller Art |
| 1935 JOHN Adjustable Pitch Propeller Patent |
| 1931 WILSON Adjustable Propeller Patent Print |
| 1949 MOUNT Automatic Adjustable Pitch Propeller |
| 1943 ADOLF Adjustable Pitch Propeller Patent |
| 1942 OUTBOARD MARINE Automatic Adjustable Propeller |
| 1951 BENSON Adjustable Propeller Patent Print |
| 1930 JAKOB Adjustable Propeller Patent Print Art |
| 1947 KORFF Adjustable Pitch Propeller Patent |
| 1952 UNITED AIRCRAFT CORP Adjustable Propeller Cuff |
| 1922 COLIN Adjustable Propeller Device Patent |
| 1923 SPENCER Adjustable Reversible Propeller Art |
| 1937 REED Adjustable Area Propeller Blade Patent |
| 1968 LANGHJELM Adjustable Variable Pitch Propeller |
| 1952 HAWKINS Adjustable Pitch Propeller Aircraft |
| 1949 TURNBULL Adjustable Pitch Propeller Patent |
| 1958 GORDON Boat With Adjustable Propeller Shaft |
| 1920 BELDIN Adjustable Propeller Patent Print |
| 1936 KOTELEVTSEFF Adjustable Propeller Patent |
| 1921 SETH HART Adjustable Propeller Patent Print |
| 1923 CARTER Adjustable Pitch Propeller Airplanes |
| 1958 ROSSMAN Adjustable Pitch Propeller Patent |
| 1965 CURIONI Adjustable Pitch Propeller Patent |
| 1947 DE FILIPPIS Adjustable Propeller Patent |
| 1961 MOORE Automatically Adjustable Propeller |
| 1937 FRANK Adjustable Pitch Propeller Patent |