(a) A person who performs work or assists in manufacturing timber into lumber has a lien upon the lumber while it remains at the mill where it is manufactured, or in the possession or under the control of the manufacturer, whether the work is done at the instance of the owner of the logs or an agent of the owner, or a contractor or subcontractor of the owner.
(b) In this section “lumber” means logs or other timber sawed or split for use, including beams, joists, planks, bolts, shingles, rails, stays, hoops, and every article manufactured from timber.