Paragraph 13
For the purpose of these Regulations—
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“Part A mobile plant” means mobile plant used to carry out a Part A activity (including such plant which is also used to carry out a Part B or Part C activity);
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“Part B mobile plant” means mobile plant used to carry out a Part B activity, not being Part A mobile plant;
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“Part C mobile plant” means mobile plant used to carry out a Part C activity, not being Part A mobile plant or Part B mobile plant.