Interesting that you have your father's photos dated 1947. I have a photocopy of a Library and Archives ( Ottawa) memorandum "Visit, Ft Bliss 17,18,July 1951 written by Lt Col J.A. Stairs which describes the trials on the Radar AA No 4 Mk 6/1. His para 2 states quote... The MZPI is performing extremely well and US officers are impressed... unquote. It was being directly compared to the US surveillance radar of the T-33 FCS, which was the forerunner of the M-33 FCS, which Canada later purchased for use with 90 mm AA guns.
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