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| Date: | 1910 |
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| Description: | The Curtiss Pusher owned by Arthur Pratt Warner of Beloit, the first man to fly in Wisconsin and the first person to purchase an airplane. Slightly below ... |
| Date: | 09 06 1948 |
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| Description: | A postcard advertising the invention of the telecamera by William Pitt Fessenden in 1941 in Phlox, Wisconsin. |
| Date: | 08 19 1948 |
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| Description: | Text on front reads: "Telescope with 40 in. Lens, Largest in the World. Williams Bay on Lake Geneva, Wisconsin." On reverse: "The 40 inch telescope of the ... |
| Date: | 1907 |
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| Description: | Text on front reads: "The 40-inch telescope of the University of Chicago Yerkes Observatory, Williams Bay, Wisconsin. The object-glass has a diameter of 40... |
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