US Patent: 2,694,920
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| Multiple door locking system and apparatus
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Patentee:
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| Joseph F. Courtney (exact or similar names) - Oak Park, IL |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 11, 1950 |
| Granted: |
Nov. 23, 1954 |
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Jeff Joslin
Vintage Machinery entry for Berkroy Products, Inc.
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Description: |
| Co-assignees Theron "Roy" Hedgpeth and Richard L. Berkson had co-founded sheet-metal machinery maker Berkroy Products, Inc., in 1947. |
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