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Dream Hydraulics
To display hours, this unique design uses a fluorescent tube with a transparent liquid, which is distilled two pistons. The minutes made a small dial with the usual arrow. The back cover case is made of glass, which makes it possible to review the mechanism.
4 photo.
creep.ru/gadget/1161048580-gidromeh...asy-hyt-h1.html
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4 photo.
creep.ru/gadget/1161048580-gidromeh...asy-hyt-h1.html
2.
3.
4.
Source: