20. Liability of principal employer in certain cases.- (1) If any amenity required to be provided under section 16, section 17, section 18 or section 19 for the benefit of the contract labour employed in an establishment is not provided by the contractor within the time prescribed thereof, such amenity shall be provided by the principal employer within such time as may be prescribed.
(2) All expenses incurred by the principal employer in providing the amenity may be recovered by the principal employer from the contractor either by deduction from any amount payable to the contractor under any contract or as a debt payable by the contractor.
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