Betterment acts
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Statutes which provide that a bona fide occupant of real estate making lasting improvements in good faith shall have a lien upon the estate recovered by the real owner to the extent that his improvements have increased the value of the land. Also called "occupying claimant acts."
Jones v. Hotel Oo., 86 Fed. 386. 30 C. C. A. 108.