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July 5, 1921. MUIGA CONFIDENTIAL C.M. SOMARC TMA HATU Comparison of old and new Luminous Material. OLD NEW Grade mkg per gram Luminosity mkg per gram Luminosity D 100 100% 75 115% E 66.6 " 56 115 F 50. "P 40 97 x G 33.3 TF 26 107 I 16.6 TP 14.1 110 K 10. 11 9 105 I - - 8.3 TY 7 110 Decrease per unit in Meso. D 25% E 16 F 20 G 22 I 13 K 10 L- 16