Fret-woule tiyo san pwoblem (GB3639-2000) se yon fini fret-trase oswa fret-woule presizyon tiyo san pwoblem ak presizyon segonde dimansyon ak fini bon pou estrikti mekanik ak ekipman idwolik. Fret woule (rele) tiyo san danje yo divize an jeneral tiyo asye, ki ba ak mwayen presyon bouyi asye bouyi, tiyo bouyi segonde bouyi segonde, tiyo asye asirans asye, Tiyo asye pur, tiyo petwol fann, ak lot tiyo asye, osi byen ke tiyo kabon-miray asye- mi, tiyo asye alyaj-miray- asye, Nerjaveei tiyo asye-woule, tiyo asye pur.
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