Desk Electronic Calculators

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Hitachi KK521

Hitachi KK521

Hitachi KK521

Display is 12 digits, separate green vacuum-fluorescent tubes.

4 functions, memory.

Uses a mixture of large-scale integration (LSI) integrated circuits and smaller ones. Main ICs - Hitachi HD3234P, HD3235P, HD3236P here date coded early 1972.

218 x 254 x 80 mm (8.6" x 10" x 3.2").


Made in Japan.

Has a pull-out carrying handle.

Hitachi also produced desk calculators for Singer Friden, see the Singer Friden EC1117.

Inside Hitachi KK521

With the cover removed to show the integrated circuits and the display tubes.

Vintage Calculators

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