R. F. Mann and R. T. Grimmer
Mann and Grimmer set up a business making and selling model aircraft. Nothing special in that except Mann was a school pupil and Grimmer his teacher at the time! I believe it was they who subsequently produced a full size aircraft (that wasn't very successful). This link will take you to a web page that details this project.
Below are scans of the pages from their interesting brochure.
Below are scans of the pages from their interesting brochure.
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