Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 5310314 | Directional control system for rotary wing aircraft A tip brake unit for installation in tip portions of rotor blades of rotary wing aircraft having a plurality of load-carrying rotors has a frame of a size and shape for installation in a tip portion of a rotor blade. An elongate tip brake member of channe... | 05/10/1994 |
