METHOD OF INHIBITING SCALE

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W.R. GRACE & CO.-CONN.

from GRACE MERGER CORP., A CORP. OF CONN. (CHANGED TO), W.R. GRACE & CO., A CORP. OF CONN. (MERGED INTO)

MERGER EFFECTIVE DATE: MAY 25, 1988 CONNECTICUT Recorded 1988-08-05

W.R. GRACE & CO.

from DEARBORN CHEMICAL COMPANY

MERGER Recorded 1986-03-19

DEARBORN CHEMICAL COMPANY, A CORP. OF DE

from CHEMED CORPORATION, A CORP. OF DE

ASSIGNMENT OF ASSIGNORS INTEREST. Recorded 1982-03-15

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