Every underground working over forty feet deep shall have a proper head house and proper trap doors which, when installed subsequent to the effective date of this act, shall be constructed of fire-resistant material.
N.Y. Lab. Law § 415
Every underground working over forty feet deep shall have a proper head house and proper trap doors which, when installed subsequent to the effective date of this act, shall be constructed of fire-resistant material.
N.Y. Lab. Law § 415