wiper

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wiper

1. any piece of cloth, such as a handkerchief, towel, etc., used for wiping
2. a cam rotated to ease a part and allow it to fall under its own weight, as used in stamping machines, etc.
4. Electrical engineering a movable conducting arm, esp one in a switching or selecting device, that makes contact with a row or ring of contacts
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

wiper

[′wī·pər]
(electricity)
That portion of the moving member of a selector, or other similar device, in communications practice, which makes contact with the terminals of a bank.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.