Will ” screw technology ” play acme – answer dish medical vacuum screw technology
The mankind gets vacuum history the earliest, but backdate arrives BC 6 centuries. Smelting furnace, the blast of furnace of make pills of immortality is set is to use negative pressure inspiratory reach pressure boost exhaust. At the same time the Chinese also is the earliest use medical the nation of vacuum system, concern the record that treats at ” of “ part way in the Western Han Dynasty, horny way namely the “ cupping ” that our common weighs, make full use of air heat bilges cold shrink, vapour condensation forms vacuum to have treatment. In