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20) Wheeler 1982, p30: "in November 1938 (Epiphone) formally introduced a line of gut-string guitars (-225)." 21) Fisch 1996, p35/p38. The Century Mandolin on p31 was illustrated with a retouched image of the Model M Mandolin as shown in the 1937 flyer.The 1939 catalog introduced Epiphone's "E" logo, shown on the new enclosed tuners and in the lining of case lids; the "E" logo was registered as trademark in 1941 with the statement "claims use since Apr 15, 1939" (Official Gazette of the U. 22) Advert "Down beat", Feb 1939 (Fisch 1996, p35/p38).2) This flyer was dated to 1931 by some researchers (Fisch, Gruhn, Carter). Furthermore, guitarist Carl Kress who was prominently featured in the 1932 catalog is no longer mentioned (obviously because Kress had become an endorser of Gibson by 1933).There are two slightly different versions of this flyer, the later one stating changes to the models Blackstone (increased price , "brown mahogany") and Olympic (increased price ).
24) Bass models announced in "The Music Trades", June 1940 (Fisch 1996, p172).
14) Advert "Down beat", Sept 1937, p37; Frequensator prototype pictured in advert "Down beat", July 1936, on Tom Morgan's De Luxe (source: Fisch 1996, p188/p74); Herb Sunshine filed patent June 12, 1937; see also Fisch 1996, p71f.