| 1934 LA Aircraft Sustaining Rotor Patent Print |
| 1949 UNITED AIRCRAFT CORP Rotor Patent Print Art |
| 1939 JAMIESON Aircraft Sustaining Rotor Patent |
| 1958 UNITED AIRCRAFT CORP Rotor Head Patent |
| 1940 JAMIESON Aircraft Sustaining Rotor Patent |
| 1949 PENTECOST Aircraft Rotor Drive Patent Print |
| 1947 MCDONNELL AIRCRAFT CORP Rotor Blade Patent |
| 1950 UNITED AIRCRAFT CORP Rotor Support Patent |
| 1934 LARSEN Aircraft Sustaining Rotor Patent |
| 1953 UNITED AIRCRAFT CORP Rotor Head Patent |
| 1940 LARSEN Aircraft Sustaining Rotor Patent |
| 1949 BOEING CO Aircraft Rotor Drive Patent Print |
| 1957 MICHEL Aircraft With Enclosed Rotor Patent |
| 1963 UNITED AIRCRAFT CORP Rotor Head Patent |
| 1964 LOCKHEED AIRCRAFT CORP Rotor Patent Print |
| 1935 PECKER Aircraft Sustaining Rotor Patent |
| 1941 PITCAIRN Aircraft Sustaining Rotor Patent |
| 1942 JAMIESON Aircraft Sustaining Rotor Patent |
| 1952 UNITED AIRCRAFT CORP Rotor Blade Patent |
| 1938 JAMIESON Aircraft Sustaining Rotor Patent |
| 1938 CAMPBELL Aircraft Sustaining Rotor Patent |
| 1953 PREWITT Aircraft Propeller Or Rotor Patent |
| 1949 MCDONNELL AIRCRAFT CORP Rotor Blade Patent |
| 1947 UNITED AIRCRAFT CORP Rotor Blade Patent |
| 1939 LARSEN Aircraft Sustaining Rotor Patent |
| 1946 UNITED AIRCRAFT CORP Foldable Rotor Patent |