Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: An gina Mark IV ta masana'antun shida: Metropolitan (mafi yawan masu ginin), Fosters na Lincoln, Armstrong-Whitworth, Coventry Ordnance Works, William Beardmore da Kamfanin da Mirrlees, Watson & Co., tare da babban samarwa a 1917. An ba da umarni na farko don tankuna 1,000 tare da Metropolitan a watan Agusta 1916. Daga nan aka soke shi, aka sake dawo da shi sannan aka gyara shi tsakanin watan Agusta da Disamba 1916. Sauran masana'antun, sun yi kwangila don ba fiye da tankuna 100 ba, sun kasance da yawa daga rikici tsakanin Stern da War Office.  Tambaya: Da yawa masana'antun daban-daban suka gina Mark IV?
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