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US Patent: 1,950,501
Rock crushing plant
Patentee: John J. MacKay (exact or similar names) - Minneapolis, MN USPTO Classifications: 209/288, 236/92R, 241/101.71, 241/155, 241/78, 241/80 Tool Categories: specialty machines : ore processing apparatus stoneworking : stone crushers Assignees: Diamond Iron Works, Inc. - Minneapolis, MN Manufacturer: Diamond Iron Works - Minneapolis, MN Witnesses: Unknown	Patent Dates: Applied: May 16, 1931 Granted: Mar. 13, 1934 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Diamond Iron Works
Description: The assignee also made sawmill machinery.

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