| Time Period Manufactured | Pre-1930 |
|---|---|
| Country of Origin | United States |
Check the listing for details. CA 1880s ELECTRO-MECHANICAL DOUBLE DRUM ASTRONOMICAL RECORDING CHRONOGRAPH. Made in United States. Listed at 1800.00 USD. If nothing else had been gained by it but this, the benefit would be incalculable. This was done, and the device was found to operate perfectly and without injury to the clock. The apparatus was at once adopted for use by the survey.
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