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Vintage 1978 ARROW HANDICRAFT #675 ELECTRIC ROLLING BALL CLOCK Brown | eBay
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Ball_Bearing_Clock
EUROtops Clock 'n' Roll Clock / Marble Clock Time Machine, Mechanical Clock 80s Style, Metal Balls, Battery/Power Supply, Colour: Black, Size: 26 x 20 x 16 cm : Amazon.de: Home & Kitchen
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inclined-plane clock; rolling-ball clock; clock-case | British Museum
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A BRASS BALL BEARING GRAVITY CLOCK BY WILLIAM R. SMITH, the brass open case with knopped and turned pillars and fret pierced spandrels, the moulded wooden base raised on flattened ball feet,
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