US Patent: 847,849
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| Trolley for traveling cranes
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Patentee:
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| George A. True (exact or similar names) - Detroit, MI |
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Patent Dates:
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| Applied: |
Jun. 30, 1906 |
| Granted: |
Mar. 19, 1907 |
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Jeff Joslin
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Description: |
| An example of this crane, marked with the patent number, existed at the old Detroit Dry Dock Company as late as 2002 but by that time the crane was a twisted ruin. Before that, the crane must have been heavily used, first by steam-engine builders Dry Dock Works and then by Detroit Edison, with a span of 37 feet over the length of the building and a height of up to 36 feet. The Northern Engineering crane was a 40-ton model that replaced a 20-ton electric crane made by Shaw Electric Co. |
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