Maintenance

Maintenance (Wikipedia)

The technical meaning of maintenance involves functional checks, servicing, repairing or replacing of necessary devices, equipment, machinery, building infrastructure, and supporting utilities in industrial, business, and residential installations. Over time, this has come to include multiple wordings that describe various cost-effective practices to keep equipment operational; these activities occur either before or after a failure.

A tractor being mechanically repaired in Werneuchen, 1966
Field repair of aircraft engine (1915–1916)
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