Gufunga iterambere ryikoranabuhanga icyiciro cya mbere

Hagati ya 1926 na 1933, NielsA Christensen wo muri Danemark wavumbuye kandi akora imashini yarushijeho gutera imbere no gushyira mu bikorwa ubu bwoko.Ubuhanga bwe (O-ring) bwasohowe mu 1930, butangwa mu 1933, kandi butwara igihembo kinini mu 1938.

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Igihe cyo kohereza: Ugushyingo-07-2022