P.R. Laws tit. 11, § 137
Whenever an employe(r) enters into a contract, either written or verbal, with an independent contractor to do part of such employer’s work, or whenever such contractor enters into a contract with a subcontractor to do all or any part of the work comprised in such contractor’s contract with the employer, such contract or subcontract shall not bar the liability of the employer for injuries to the employees of such contractor or subcontractor, by reason of any defect in the condition of the ways, works, machinery, or plant, if they are the property of the employer, or furnished by him, and if such defect arose or had not been discovered or remedied through the negligence of the employer or of some person entrusted by him with the duty of seeing that they were in proper condition.
History —Mar. 1, 1902, p. 150, § 7.