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Patent specification
Provisional Specification. Improvements in Aeroplanes or Flying-machines. No. 2421. Date of application, 29th Jan. 1914, Complete specification left, 31st Aug. 1914 - accepted, 6th May 1915. Patent applied for by Charles Horace Watkins of 45 Colum Road, Cardiff. Four pages with two fold out diagrams containing five figures.
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