Number | Name | Date | Kind |
---|---|---|---|
RE27711 | Blake | Feb 1941 | |
1126027 | Jullig | Jan 1915 | |
1150799 | Wood | Aug 1915 | |
1289418 | Elmen | Dec 1918 | |
1812392 | Zuschlag | Jun 1931 | |
2129058 | Hedden | Sep 1938 | |
2358027 | Penther et al. | Sep 1944 | |
2994015 | Eidam | Jul 1961 | |
3487306 | Harmer | Dec 1969 | |
3611119 | Madewell | Oct 1971 | |
3704413 | Blevins | Nov 1972 | |
4084136 | Libby et al. | Apr 1978 | |
4095181 | Harris et al. | Jun 1978 | |
4107605 | Hudgell | Aug 1978 | |
4206391 | Varacins | Jun 1980 | |
4300094 | Piso et al. | Nov 1981 | |
4326166 | Pigeon et al. | Apr 1982 |
Entry |
---|
Whitehead, "Metal Pipe or Wiring Locator", Practical Electronics, vol. 12, No. 12, pp. 952-955, Dec. 1976. |