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Patent No
editInfo from Kahn's The Codebreakers: the M-325 patent is one of 2,395,863; 2,552,548; 2,877,565. (I'll check tomorrow.) — Matt 22:52, 29 Nov 2004 (UTC)
Patent 2,877,565
editI posted a PDF of most of the patent here: http://www.ilord.com/US2877565A.pdf The patent listed on the main page is not working, at least for me. --Boblord 04:01, 28 May 2006 (UTC)