Ok I know that sounds like a naïve newbie question.
I was clicking around on e-Bay, ran across one and had never heard of this type of shutter. Bulb-and-hose actuation I gather. But what else is there to know? ?Who made them, do they work well enough, can they be repaired/refurbished and so on . . . .?
https://www.ebay.com/itm/17449756886...0AAOSwpo9fTZE9
Any remarks appreciated.
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