Sand timer

Measuring – testing – or signalling instruments – Time-measuring instrument or casing – Sandglass

Patent

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Patent

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D02984202

REFERENCES:
patent: D282056 (1986-01-01), Levine
patent: 3438197 (1969-04-01), Roer
patent: 3533229 (1970-10-01), Liljequist

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