Prewinch

Prewinch yethulwa e-United States ngo-1940 futhi 1950s. It ekuqaleni yakhelwe njengendlela yokuvikela umugqa Helical ngoba ukucindezeleka okuhlushwa ukugqwala kagesi kanye arc ashise ukuvikelwa nqunu izintambo. Ngemva kweminyaka eminingi iziphathimandla ukuthuthukiswa, Pre-indophi iye kabanzi kutfunyelwa nekusatjalaliswa, zokuxhumana fiber-optic, ujantshi gesi, cable ithelevishini, ukwakhiwa, ezolimo kanye neminye imikhakha.


isikhathi Iposi: Apr-08-2018
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