Section 9

A strike or lock-out shall be deemed to be illegal if it Illegal strikes is commenced, declared or continued in contravention of and lock-outs any provision of sections 7 or 8 of this Act, or of any provi-

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sion of any other written law:

Provided that a lock-out declared in consequence of an

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illegal strike or a strike declared in consequence of an illegal lock-out shall not be deemed to be illegal.