Number | Date | Country | Kind |
---|---|---|---|
144504 | Dec 1998 | ESX |
Number | Name | Date | Kind |
---|---|---|---|
1161317 | Kielland | Nov 1915 | |
1697602 | Kulka | Jan 1929 | |
1899715 | Olson | Feb 1933 | |
2097320 | Fox | Oct 1937 | |
3212391 | Duffy | Oct 1965 |
Entry |
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Machine Design--The Fasteners Book; p. 137; hot (left column in Palnut advertisement), Sep. 29, 1960. |