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Home › Reinforced cement sheet product containing no asbestos for fabricating on hatschek machine

Reinforced cement sheet product containing no asbestos for fabricating on hatschek machine

US Patent 4428775 · Granted Jan 31, 1984

Estimated economic value: $2,174,000 ⓘ

Assignee

National Gypsum

Inventors

Robert M. Johnson (29 patents)
Elmer M. Melling (4 patents)

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