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More on the results of vacuum pumps:

big5.mofcom.gov.cn

pump line submicron filter fresh or conditioned air), not electrically heated, incorporating a motor-driven fan or blower, and parts thereof, of iron or steel. ...<< more>>

fta.mofcom.gov.cn

0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0 ...<< more>>

big5.mofcom.gov.cn

Other inorganic compounds (including distilled or conductivity water and water of similar purity); liquid air (whether or not rare gases have been removed); compressed air; amalgams, other than amalgams of precious metals....