The last picture also appears in an article by de Vries and Martens on the Artillerie Inrichtingen (SAM-Wapenmagazine number 66). The picture comes from the Eurometaal-archives, and shows a 31 mm canon designed by Boxman (an AI-employee). It was tested around 1930 as an anti-tank and anti-aircraft gun, but never proceeded past the testing phase. There are no specifications.
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