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Class Information
Number: 451/117
Name: Abrading > Machine > By use of plural work holders, without tool > Of valve and seat > Poppet valve
Description: Abrading machine by which a poppet valve and its seat are abraded to a fit by mutual moving contact.

Patents under this class:

Patent Number Title Of Patent Date Issued
6899605 Grinding machine May. 31, 2005
5823861 Spiral-flow barrel finishing machine Oct. 20, 1998
4581854 Valve grinding apparatus Apr. 15, 1986

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