Number | Date | Country | Kind |
---|---|---|---|
4-071528 | Mar 1992 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
1376479 | Stoughton | May 1921 | |
4681535 | Kobari et al. | Jul 1987 | |
4758270 | Bardenheuer | Jul 1988 | |
4786321 | Hoster et al. | Nov 1988 | |
4928605 | Suwa et al. | May 1990 |
Number | Date | Country |
---|---|---|
2427360 | Jan 1975 | DEX |
2704101 | Aug 1977 | DEX |
3610498 | Oct 1987 | DEX |
8706331 | Oct 1987 | WOX |
Entry |
---|
Database WPI, Week 13, 1970; AN 70-21549R & CA-A-838 032. |
Patent Abstracts of Japan, vol. 6, No. 113 (M-138) Jun. 24, 1982 & JP-A-57 041 521 (Daido Steel Co. Ltd) Mar. 8, 1982. |