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Cone-WilliamHenry-Invention-001-1904-GasGenerator.jpg

The Canadian Patent Office record and register of copyrights and trade marks v.34:no.1-6 1906:Jan.-June 1906. (no date) HathiTrust. Available at: https://babel.hathitrust.org/cgi/pt?id=wu.89081524654&seq=1473&q1=berlin&start=1 (Accessed: 5 May 2024).

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