Okla. Stat. tit. 63, § 63-983: Posting of warning signs in cranes, derricks and similar

apparatus.

No person, firm, corporation or association shall, individually

or through an agent or employee, or as an agent or employee, operate

any crane, derrick, power shovel, drilling rig, hoisting equipment,

or similar apparatus, any part of which is capable of vertical,

lateral or swinging motion, unless there is posted and maintained in

plain view of the operator thereof, a durable warning sign legible

at twelve (12) feet, reading:

"Unlawful to operate this equipment within six feet of high

voltage lines."

Each day's failure to post or maintain such signs shall constitute a

separate violation.