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B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
B23P15/08—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass piston rings from several pieces
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FR498746D1916-11-131916-11-13Perfectionnements aux segments métalliques pour pistons, et à leur fabrication
ExpiredFR498746A
(fr)