Lightproof Doors (08 34 33)
Shielded Wall Systems from Ray-Bar Engineering Corporation (May 15, 2019)
Lead Free Shielding from Ray-Bar Engineering Corporation (Jan 16, 2019)
Miller Edge Wireless Air-Wave Switch (Dec 19, 2018)
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For other relevant searches, you might want to try: doors intended to allow use without light penetration for film developing or similar operations; doors with specific characteristics to exclude light.