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PLAINTIFF'S EXHIBIT r ANNUAL REPORT TO THE MEMBERSHIP March 5, 1 976 ypsum Association SGP 0010366 SECRETARY'S REPORT SGP 0010367 REPORT OF THE SECRETARY TO THE MEMBERSHIP MARCH 5, 1976 Members of the Gypsum Association staff, along with the members of our several committees, regularly evaluate our activities.

Specialties, Heating Vapor Engineering Company 489 Fifth Avenue New York City Chas.

American Radiator Company IDEAL WATER TUBE BOILER Boilers rv Tricon Radiator Company Boilers.

Fans and Healing Equipment Johnson Fan and Blower Co. 1317 West Lake Street, Chicago, 111.

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American Society of Heating and Ventilating Engineers Guide, /19V3'S^'S^ Changing a System from Gravity to Forced Circulation f4 For example, let Fig. 8 represent the one-pipe gravity circulatdp system as designed.

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