Okla. Stat. tit. 60, § 60-7: Fixtures defined

A thing is deemed to be affixed to land when it is attached to

it by roots, as in the case of trees, vines or shrubs, or embedded

in it, as in the case of walls, or permanently resting upon it, as

in the case of buildings, or permanently attached to what is thus

permanent, as by means of cement, plaster, nails, bolts or screws.