Number | Name | Date | Kind |
---|---|---|---|
3723108 | Twigg et al. | Mar 1973 |
Number | Date | Country |
---|---|---|
47-18332 | May 1972 | JA |
44-1825 | Jan 1969 | JA |
46-32847 | Sep 1971 | JA |
637,436 | Jun 1946 | UK |
674,023 | Jun 1952 | UK |
710,413 | Jun 1954 | UK |
Entry |
---|
"Metal Selector," 1963 Ed., p. 5-14. |
"Journal of Metals" -- Tours Aime, 9/53, pp. 1149-1150. |