Maintainer n. : One who maintains.

Example:
What is the difference between a battery charger and battery Maintainer?

Taxonomy
Maintainer Corporation, Iowa, literature, Mall, Search, 2nd Ave, Sheldon, IA, New Products, Filtration System, Custom Bodies, shop, online store, DEALER LOGIN.

Defination from the web:
Manufacturer of one and two ton heavy duty service bodies, mobile lubrication units, lube skids, telescoping hydraulic cranes and more.