Preliminary Vacuum Pump

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Preliminary Vacuum Pump

 

a vacuum pump that establishes the preliminary vacuum required for the normal operation of a pump providing a higher vacuum. Mechanical pumps are usually used for this purpose.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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