| George A. Lauer (Cincinnati, Ohio) Patent illustration for "Improvements in Picture-Exhibitors" (US Patent no. 172,328) 1876, 18 January (patented) Illustration Google Books LL/82339 I'm indebted to Lee Eltzroth (Georgia Photographers Documentation Project) for bring this to my attention (Facebook, post, 1 May 2018).
Original patent: US172328A (Google Patents)
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