The Manganese Bronze reference article from the English Wikipedia on 24-Apr-2004
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Manganese Bronze

Time you got around to sponsoring a child
Manganese Bronze Holdings PLC is an engineering company based in Coventry, England. The company manufactures a range of automative parts, but is most famous for manufacturing London Black Taxis.

Manganese Bronze Holdings is split into four divisions:

Maganese Bronze first manufactured taxis in 1948, and has produced over 100,000 London Black Taxis in its Coventry plant.