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Following the Pacific Plantronics partnership with NASA in the Space Program, the MS-50 headset gained recognition in the communication marketplace. The FAA, Western Electric, and companies with telephone call centers adapted the MS-50 as a replacement for existing headsets. On May 18, 1965, U.S. Pat. No. 3,184,556 was issued to W. K. Larkin for a
Parker Otto Ackley (May 25, 1903 – August 23, 1989) [1] was an American gunsmith, barrel maker, author, columnist, and wildcat cartridge developer. The Ackley Improved family of wildcat cartridges are designed to be easily made by rechambering existing firearms, and fireforming the ammunition to decrease body taper and increase shoulder angle, resulting in a higher case capacity.
More modern designs of reusable ear-piercing instruments, such as Inverness and Studex System 75, use self-contained, single-use, sealed, and sterilised disposable cartridges or cassettes. The studs used with such systems often have thinner posts (normally 20 gauge) with sharper tips, as opposed to the thicker (16 gauge), blunter posts of the ...