The National Union of Lock and Metal Workers or NULMW is the British Trades Union for some 4,000 workers in the lock and metal manufacturing industries. It was originally formed in 1889 as the National Amalgamated Lock, Latch and Keysmiths' Trades Society, adopted the title of the the National Amalgamated Lockmakers' Society in 1920 before plumping for its current name.

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