Power transfer block for telephone systems or similar device

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

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D13147

Patent

active

D03262669

REFERENCES:
patent: D248096 (1978-06-01), Stupay
patent: D276426 (1984-11-01), De Luca et al.
patent: D297232 (1988-08-01), Gazzo
patent: D299492 (1989-01-01), Gregson
patent: D314385 (1991-02-01), Karan et al.
patent: D721295 (1983-11-01), De Luca et al.
patent: 3784728 (1974-01-01), De Bortoli et al.
patent: 4651340 (1987-03-01), Marson
patent: 4796289 (1989-01-01), Masor

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