Electronic warning machine with calculator

Printing and office machinery – Typewriter or calculator – Combined

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Patent

active

D03689255

REFERENCES:
patent: D309601 (1990-07-01), Sawada et al.
patent: D317440 (1991-06-01), Sawada et al.
patent: D328089 (1992-07-01), Haneda
patent: D334736 (1993-04-01), Sawada et al.

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