Hourglass construction

Details Hourglass construction Hourglass construction

1978-12-07

1981-05-12

Miska, Vit W.

Horology: time measuring systems or devices

Time interval

Gravity actuated type

G04F 104

Patent

active

042675880

ABSTRACT:
An hourglass construction comprising a pair of containers arranged with their mouths together and provided with a through passageway for fluent material.

REFERENCES:
patent: 372090 (1887-10-01), Shaw
patent: 2625003 (1953-01-01), Burden
patent: 3125849 (1964-03-01), Wachtel

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