Number | Date | Country | Kind |
---|---|---|---|
2925410 | Jun 1979 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
1628256 | Machlett | May 1927 | |
3699383 | Chaney | Oct 1972 |
Number | Date | Country |
---|---|---|
2625509 | Dec 1977 | DEX |
Entry |
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"Low-Power Ion Source", by N. A. Penebre, IBM Tech. Disclosure Bulletin, vol. 14, No. 5, p. 1475, Oct. 1971. |