| 摘要 |
354,602. Lock nuts. MICHA, L., 13, Rue Gerard, Antwerp, Belgium. Sept. 24, 1930, No. 28595. Convention date, Sept. 25, 1929. [Class 89 (i).] The nut having an inclined bearing face b has two recesses c formed in its upper and lower face, tangential to the threaded bore and removing part of the screw thread.
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