Wikipedia:Articles for deletion/Maintenance-free operating period
per  and lots of sources out there. XOR&#39;easter added a couple of sources to make this short stub well-referenced. A  style search quickly yields many GScholar and GBooks sources discussing the concept. Hence keep. --&#123;&#123;u&#124
— User:Mark, 12:22, 21 October 2018 (UTC)
Stance: keep
Cited policy: WP:HEY||WP:BEFORE (Wikipedia:The Heymann Standard)