Portable digital telecommunication device

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Telephone equipment

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D14137, D14240

Patent

active

D03737675

REFERENCES:
patent: D264691 (1982-06-01), Volkland et al.
patent: D267249 (1982-12-01), Fukushima et al.
patent: D277569 (1985-02-01), Georopulos
patent: D281974 (1985-12-01), Suzuki et al.
patent: D289616 (1987-05-01), Imazeki
patent: D291443 (1987-08-01), Pediielli et al.
patent: D349503 (1994-08-01), Roy
patent: D350544 (1994-09-01), Sakuta et al.
Simpson Electric Co. Advertisement from ET/D of May 1978, Model 452.
Telephony's Buyers' Guide 1990/91, p. 96, Conway Phone-A-Lyzer II.
B. A. Pargh, Spring/Summer, 1985, p. 287, Precision Telephone Product Tester at Bottom Left.

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