Industrial Disputes Act, 1947
25K. Application of Chapter V-B
(1) The provisions of this Chapter shall apply to an industrial establishment (not being an establishment of a seasonal character or in which work is performed only intermittently) in which not less than 139[one hundred] workmen were employed on an, average per working day for the preceding twelve months.
(2) If a question arises whether an industrial establishment is of a seasonal character or whether work is performed therein only intermittently, the decision of the appropriate government thereon shall be final.