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January 20, 1953 Mr.

STRICTLY CONFIDENTIAL M AY BE RELEASED ON LY BY DULY AUTHORIZED PERSONNEL (Under Secrecy Agreement with California Research Corporation) ETHYL CORPORATION Inter-Office Correspondence To: Mr.

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June 15, 1955 CIASS 5100 Non-metals of periodic groups VI and VII plus their oxides, hydroxides, and other non-metallic compounds. 5100 - 5lU9 Hydrogen and the halogens (H, F, Cl, Br, I) 5150 - 5199 Group XV non-metallic elements (0, S, Se, Te, Po) CIASS 5200 Non-metals of all other groups plus their oxides and other nonmetallic compounds, except ammonia0 5200 - 52l9 Group V, non-metal3ic elements (N, P only) 5250 - 5299 All other non-metallic elements (C, B, Si, and inert gases) 0007-PMC-000000323 June 15, 1955 Number (5120) 5150 (5160) 51A1 (51C1) (51C2) 51C3 (5lCli) (51C5) ' (51C6) : (51C7) (51C8) (51C9) SlYl Material Water Sulfur Dioxide, C.