GB Patent: GB-207,342
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| Improvements relating to means for producing non-circular apertures in cylindrical and other metal bodies
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Patentee:
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| Joseph Jewsbury (exact or similar names) - Birmingham, England |
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Patent Dates:
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| Applied: |
Oct. 19, 1922 |
| Granted: |
Nov. 29, 1923 |
Espacenet patent
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Jeff Joslin
"Vintage Machinery" entry for James Archdale & Co.
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Description: |
| "Primarily the object of this invention is to provide improved means for producing automatically non-circular ports, and especially quadrilateral or triangular ports, in cylindrical valves or other lines, though it is applicable to a variety of like uses..." |
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