Number | Name | Date | Kind |
---|---|---|---|
2259367 | Ely et al. | Oct 1941 | |
2574003 | Wymer, Jr. | Nov 1951 | |
3802681 | Pfeifer | Apr 1974 | |
4152568 | Yamaguchi et al. | May 1979 |
Number | Date | Country |
---|---|---|
2758528 | Jul 1978 | DEX |
52-22539 | Feb 1977 | JPX |
Entry |
---|
Welding Handbook; Section 3A; Sixth Edition; American Welding Society; N.Y. 1970; p. 44.64. |