Number | Name | Date | Kind |
---|---|---|---|
D236817 | Sweany | Sep 1975 | |
D240121 | Pasquarette | Jun 1976 | |
2822534 | Miller | Feb 1958 | |
3537094 | Hawkins et al. | Oct 1970 |
Entry |
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Best Products Buyer's Book #118, 1975, p. 160 B, Apartment Alarm with Delay. |
Popular Science, May 1978, p. 103, Water Detector. |