Number | Date | Country | Kind |
---|---|---|---|
52-79760[U] | Jun 1977 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3660656 | Frank et al. | May 1972 | |
3742237 | Parker | Jun 1973 | |
3862420 | Banks et al. | Jan 1975 | |
3976880 | Brunelle et al. | Aug 1976 |
Number | Date | Country |
---|---|---|
7414927 | Apr 1975 | NLX |
Entry |
---|
Research Disclosure Feb. 1974; pp. 28, 29. |