C. E. Hopkins
Lens-Mounted Brass Shutter - c. 1892
No. 3 (3" diameter)
No. 4 (4"
Notes: This shutter,
formerly described as unknown on this page, has been identified as a Hopkins
Shutter, which was patented by L. Prosch in 1891, and subsequently marketed by
C. E. Hopkins as The Pneumo Shutter.
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