1. Some countries distinguish between lightproof and airproof types; others have the same term.

2. I have a beautiful pleathery corinthian leathery red bellows on my Graphic View II; and My Toyo Technical View Camera has two delightfully lightproof Bellowses, one in …

3. Said sensor comprises a fibre lightguide provided with a lightproof cladding, two photoelectronic transducers, two units for taking the logarithm of electric signals, and a subtract and adder of two electric signals.