140. Nothing in this Part or in any regulations made thereunder shall, unless it is expressly otherwise provided by such regulations, apply to-
(a) ships of war and troopships; |
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(b) cargo ships of less than five hundred tons gross tonnage; |
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(c) ships not propelled by mechanical means; |
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(d) wooden ships of primitive build; |
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(e) pleasure yachts not engaged in trade; |
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