| http://www.w3.org/ns/prov#value | - 'Is that a part of his principal employment, or is that preliminary; or, if he is required to do it after the close of the shop in the afternoon, is that a part of the 'postliminary' work for which there is to be no compensation unless there is a contract or unless it has been the practice and custom for the employer to pay for the extra work done at his command?
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