(GB 4136), a copy of the prototype was shown to London opticians and copied before the patent was granted
Text from Wikipedia, available under CC BY-SA 4.0.
- #wikipedia
- #event
(GB 4136), a copy of the prototype was shown to London opticians and copied before the patent was granted
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-17 from Wikipedia. The archived copy is preserved so this citation survives link rot.