2299. 4-1/4" long:
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2300. The top part is about 5" long:
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The upper piece can pivot and has a weight under it to keep it horizontal:
2301. Approximately 14" long:
2302. 27" tall:
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2303. About 9" long:
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2304. 4" long, sent in by a visitor who is looking to identify this device that he found in his grandfather's shed twenty years ago:
Answers:
2299. A grate bar for a stove, it allows ashes to fall through and air to circulate, patent number 730,772:
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2300. The most popular guess for this one is that it's a counting tray, possibly for use by a pharmacist, who could then pivot the tray to pour the contents into an envelope or other container. The second most popular suggestion is that it's for dispensing a fixed weight of a product, which would be loaded onto the pan and when a certain weight was reached, the pan would tilt and pour it into a container of some type.
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2301. A tool for removing the cables from a battery, patent number 1,602,685:
2302. A light from a TV news stage:
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2303. An egg cracker and separator, it can be seen in use here:
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2304. A Morgan Lee wallpaper trimmer (scroll down at the link):
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More discussion and comments on these photos can be found at the newsgroup rec.puzzles.