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US Patent: 830,003
Process of rendering cement blocks waterproof
Patentee:
John M. Rauhoff (exact or similar names) - Tinley Park, IL

USPTO Classifications:
427/343

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Oscar W. Bond
Walker Banning

Patent Dates:
Applied: Sep. 30, 1905
Granted: Sep. 04, 1906

Patent Pictures:
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