253. Nothing in section 251 or 252 shall entitle any person to remuneration-
(a) in respect of services rendered contrary to an express and reasonable prohibition of such services on that part of the vessel to which such services are rendered; |
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(b) in respect of services rendered by a tug to or in respect of the vessel which she is towing, or the cargo thereof, except where such services are of an exceptional character such as are outside the scope of the contract of towage; |
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(c) if he has caused the distress giving rise to the salvage, either intentionally or through negligence; |
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(d) if and to such extent as It appears that he has concealed or unlawfully disposed of any property salvaged. |
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