30. Any notice, order or document required or authorized under this Act or any regulation made hereunder to be served on any person, may be served-
(a) by delivering it to that person or by delivering it at the usual or last known address of abode or business of that person in a cover addressed to such person ; |
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(b) by sending it by registered post addressed to that person at his usual or last known place of abode or business. |
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