Roy B. Kester, Accounting theory and practice… (1922)
“ Maintenance has to do with those costs which maintain an asset in good operating condition; repairs have to do with those costs necessary to put an asset in operating condition after a condition of inefficiency has been reached which the maintenance costs have not been able to prevent; a replacement cost is incurred when it becomes necessary to replace some part or the whole of an asset, neither maintenance cost nor repair costs having been able to maintain the asset in efficient operating condition. Where only a part of an asset is to be replaced, it is often spoken of as a renewal of parts. ”
