3. In this Act" authorized representative ", when used with reference to a trade union, means any person who has been appointed by the President or the Secretary of that union to be a representative of that union for the purpose of this Act; " certificate of identity ", when used with reference to any person who is an authorized representative of a trade union, means a document issued to such person by the President or the Secretary of that union and stating that for the purposes of this Act such person is a representative of that union; " estate " means any land or group of lands-
(a) which forms a separate and distinct property;
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(b) which belongs to or is held by one or several persons; and
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(c) of which an extent of not less than fifty acres is under cultivation for any purpose other than the production of foodstuffs as defined in the Food Production (Estates) Act; and
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| " trade union " means any trade union registered under the Trade Unions Ordinance. |