US Patent: 2,497,471
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| Tape Construction
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Patentee:
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| Nathan H. Shillman (exact or similar names) - Baltimore, MD |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Sep. 10, 1947 |
| Granted: |
Feb. 14, 1950 |
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Russ Allen
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Description: |
| Open frame design for tape measure used primarily for sounding the depths of wells and tanks containing oil or other liquids with a plumb bob. Provision is alow made for a wiping device with side guide lips to clean the tape as it passes through and prevent jamming.
Shillman references his two earlier patents: 1,485,634 and 1,679,178 which have a closed casing and wiping device.
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