planned maintenance
any variety of scheduled maintenance to an object or item of equipment
Conservation-restoration of Thomas Eakins' The Gross Clinic
history of conservation techniques for large painting in Pennsylvania, US
track maintenance
method or steps that maintain, clean up, or repair a railway and lengthens its lifespan
sharpening
process of creating or refining a sharp edge of appropriate shape on a tool or implement designed for cutting
service of a motor vehicle
periodic maintenance of a motor vehicle