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2024-10-13 10:14:26 UTC
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Steveg58 on Nostr: 16 maybe? No clue what the MB is in aid of. Although, something to do with the colour ...

16 maybe? No clue what the MB is in aid of. Although, something to do with the colour spectrum perhaps?
Okay I found that type B is a tungsten film ... still no Idea about the M.