Hatimi ci gaban fasaha mataki na daya
Tsakanin 1926 da 1933, mai ƙirƙira na Danish kuma mai yin injin NielsA Christensen ya ƙara haɓaka tare da yin amfani da irin wannan da'ira.An buga fasaharsa (O-ring) a cikin 1930, an ba da izini a 1933, kuma ya sami babbar kyauta a 1938.
Lokacin aikawa: Nuwamba-07-2022
