Drawing from the Army Experimental Station Peenemünde dated 1939. The specification describes an insert template that could be used for a range of outlet and inlet orifice sizes. The German text beginning (eingedrehte ...) translates as 'Center-line of screw used for holes to be drilled later', and the hole dimensions are not specified on this document. HVP drawing number 1113 E, Deutsches Museum München
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