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REOT is 7 TRADE MARK.REGISTERED HERBERT N.McCOY, company JUN24 16/E. GRAND AVENUE. CHASR.LINDSATSM SNERBURNE, MGR ELEC. DTV. mr. a 3. Lee, Chicago June, 22, 1927 Pass. u.s. Radium Cerp 535 Reland SR, newyork Dear mider your letter of the 15th doubtless reached its distribation last friday; but as next, d did not get it until monday the 20th & did not go te Lindsays that day or the On Hemday, the 19th l mailed you a letter which you han double record. I also wildgoon monday might that & would ship lot #43 of ness tuesday. This I did, by amer. Ry. Exp. as usual. Lut #43 Consists of two tubes # 43 A, containing 102.4, mille graws and # 43B , 108.7 mgs. This lost lot was finished and sigled up Feb. 14, 1926. The abon amounts are those found 40 days after Realing in the usual manner The porice of $375 60 that you han paid for lots 41 and 42 was for material artificially aged. the meso you lots was identical in composition and radio activity with that 2 years naturally aged you Z years. my advantage old therefore of equal value to you as material