I recently got a bunch of miscellaneous darkroom equipment and I'm too green to even know what it is or what it is supposed to be used for. First photo, is from left to right, some kind of handle...I don't know if this is for a camera or what. It seems very well-built though, so it must be old. In the middle is a Honeywell device with rotatable silver reflectors. It looks like it could be a flash for old flashbulbs, but the socket is very strange. I don't know what flashbulb fixtures look like. On the right is probably a flash too but the socket is different from the one in the center. Can one still buy flashbulbs anymore? The next photo is of a glass negative carrier, but the packaging doesn't say what it is to. Any idea what enlarger this fits? The last photo, and I have three of these, are hard rubber tanks. I've never processed sheet film so I'm trying to figure out how these were originally used. I think they must have been used to soup 4x5 sheets that were somehow dipped into them. They are made out of real hard rubber and not plastic.