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Burroughs C3661 Desktop Calculator

Note: photo of Burroughs C-3660, which is identical in appearance to the C-3661.

Burroughs 16-digit Nixie display Desktop Programmable Calculator, Circa 1971-1973. C3661 and C3600 were visually identical, but the 3661 adds double the number of steps of program memory, a subroutine capability, and additional test/branch operations. Mag-Card reader for program storage. Early LSI chip-based calculating engine. Wanted in any condition, working or not.