
In the US, a blue-collar worker is a working class person who performs manual labour. Blue-collar work may involve skilled or unskilled manufacturing, mining, sanitation, custodian work, oil field, construction, mechanical, maintenance, technical installation and many other types of physical work. Often something is physically being built or maint...
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http://en.wikipedia.org/wiki/Blue-collar_worker

(from the article `industrial relations`) It should be noted that blue-collar workers who have highly marketable skills derive individual bargaining power from their potential mobility. In ... Blue-collar workers[2 related articles]
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http://www.britannica.com/eb/a-z/b/81

Blue collar worker is an employee whose primary responsibilities require manual labor and the use of physical strength to create a product or deliver a result.
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https://www.myaccountingcourse.com/accounting-dictionary/accounting-diction
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