Helena A. Schwarz, GB190521878A
Improvements in Clamping Devices for Curtain Stretchers.
Image credit: Schwarz, H.A. (1905)
On November 30, 1905, Helena Ana Schwarz of Waterbury, Connecticut, patented an improved clamping device for curtain stretchers. Her design used a cam-operated lever and adjustable metal plate to securely adjust wooden stretcher bars without damaging them.
Date of Application: 27 October 1905
Date of Issuance: 30 November 1905
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Francesca Chiaradia
PhD Candidate in Economics
My research interests include innovation, law, and information economics.