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Capping off window glass cylinders preparatory to flattening, somewhere in Pennsylvania, circa 1910.
flipFlip to Cylinders of window glass stored ready for flattening, circa 1910.
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A worker is capping off window glass cylinders preparatory to flattening, while another worker watches.

Credit: From Pennsylvania and Its Manifold Activities, 1912.

Capping off window glass cylinders preparatory to flattening, somewhere in Pennsylvania, circa 1910.

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