Fetal communication device

Recording – communication – or information retrieval equipment – Computer – data processor equipment

Patent

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Details

D14 92, D14 67, D14 12, 181 21, 128 1R

Patent

active

D02972344

REFERENCES:
patent: D59543 (1921-11-01), Durod
patent: 434672 (1890-08-01), Mersick
patent: 534543 (1895-02-01), Berliner
patent: 564898 (1896-07-01), Perpente
patent: 735645 (1903-08-01), Wood
patent: 1656914 (1928-01-01), Hart
patent: 1922385 (1933-08-01), McKesson
patent: 3082838 (1963-03-01), Gajdosik
patent: 3346069 (1967-10-01), Speelman
patent: 4187635 (1980-02-01), Deissler
patent: 4685448 (1987-08-01), Shames et al.

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