Okla. Stat. tit. 21, § 21-1265.7: Posting property of producers of defense materials and

public utilities - Entry without permission.

Any individual, partnership, association, corporation, municipal

corporation or state or any political subdivision thereof engaged

in, or preparing to engage in, the manufacture, transportation or

storage of any product to be used in the preparation of the United

States or of any of the states for defense or for war or in the

prosecution of war by the United States, or the manufacture,

transportation, distribution or storage of gas, oil, coal,

electricity or water, or any of said natural or artificial persons

operating any public utility, whose property, except where it fronts

on water or where there are entrances for railway cars, vehicles,

persons or things, is surrounded by a fence or wall, or a fence or

wall and buildings, may post around his or its property at each gate

entrance, dock or railway entrance and every one hundred (100) feet

of water front a sign reading "No Entry Without Permission".

Whoever without permission of such owner shall willfully enter upon

premises so posted shall be punished by imprisonment for not more

than ten (10) days, or a fine of not more than Fifty Dollars

($50.00), or both.