The construction of any headframes and the material used therein shall be sufficiently strong and durable to assure its withstanding any working stress put upon it.
Ariz. Admin. Code § R11-1-1101
The construction of any headframes and the material used therein shall be sufficiently strong and durable to assure its withstanding any working stress put upon it.
Ariz. Admin. Code § R11-1-1101