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- Motor Controller Used at the Yerkes Observatory, Williams Bay, Wisconsin, circa 1897 -
- circa 1897
- Collections - Artifact
Motor Controller Used at the Yerkes Observatory, Williams Bay, Wisconsin, circa 1897
- Correspondence Regarding Donation of Yerkes Observatory Motor Controllers, 1942 -
- November 25, 1942
- Collections - Artifact
Correspondence Regarding Donation of Yerkes Observatory Motor Controllers, 1942