Number | Name | Date | Kind |
---|---|---|---|
1626352 | Olson | Apr 1927 | |
2464173 | Broadmeyer | Mar 1949 | |
2767982 | Noon | Oct 1956 | |
4045018 | Michelson | Aug 1977 |
Number | Date | Country |
---|---|---|
55-84744 | Jun 1980 | JPX |
Entry |
---|
IBM Technical Disclosure Bulletin, vol. 16, No. 11, Apr. 1974, pp. 3676 and 3677, J. Guttehing. |