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CA Patent: CA-3,000
Venetian blind
Patentees: Major Harper (exact or similar names) - Whitby, ON Canada Stephen Grose (exact or similar names) - Whitby, ON Canada William Wallace Byam (exact or similar names) - Whitby, ON Canada USPTO Classifications: Tool Categories: Assignees: None Manufacturer: Major Harper & Son - Whitby, ON Canada Witnesses: Unknown	Patent Dates: Applied: Nov. 07, 1873 Granted: Jan. 13, 1874 Patent Pictures: CIPO Data Espacenet patent Report data errors or omissions to steward Jeff Joslin "Vintage Machinery" entry for Major Harper & Son
Description: The inventors are all described as "machinists".

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