U.S. patent number D291,803 [Application Number 06/756,242] was granted by the patent office on 1987-09-08 for implement for activating and deactivating a telephone hook switch. Invention is credited to Robert D. Mantell.
United States Patent | D291,803 |
Mantell | September 8, 1987 |
Inventors: | Mantell; Robert D. (Los Angeles, CA) |
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Appl. No.: | 06/756,242 |
Filed: | July 18, 1985 |
Current U.S. Class: | D14/240; 379/448 |
Field of Search: | ;D14/59 ;379/448,425 |
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1394862 | May 1972 | GB | |||
178117 | Jul 1923 | GB | |||
0124162 | Jul 1985 | JP | |||
Telephony, vol. 73, Nov. 3, 1917, p. 44; S. Carlson Battery Cover Attachment at FIGS. 1-3. . Telephony, vol. 70, No. 16, p. 44, 4/15/1916: S. R. Automatic Battery Cut Out.. |
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