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P I W I Y end A L M Y Chemical C o m p a n y DIVISION OF W.
R. G R A C E
&
Co.
Cambridge 4 0 , Massachusetts SALES O F F I C E S - 6 2 WH1TTEMORE A V E N U E , CAMBRIDGE 4 0 , MASSACHUSETTS • 100 WEST M O N R O E STREET, C H I C A G O 3, ILLINOIS • 1060 BROAD STREET, N E W A R K 5, N E W JERSEY • West C o a s t — M A R T I N , H O Y T & M I L N E , I N C . - L O S A N G E L E S , S A N F R A N C I S C O , SEATTLE & P O R T L A N D
5070
C&EN
NOV.
2 1,
1955