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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7366294 | Communication system tonal component maintenance techniques An apparatus and method for suppressing noise is presented. The apparatus may utilize a filter bank of bandpass filters to split the input noisy speech-containing signal into separate frequency bands. To determine whether the input signal contains speech, DTMF tones... | 04/29/2008 |
| 4535201 | Ground start detection in telephone loop signalling circuit A circuit configuration for a telephone loop signalling circuit, for detecting a ground start condition on a telephone line. The circuit operates without modification under both loop start and ground start conditions in the presence of heavily induced pow... | 08/13/1985 |
