Horology: time measuring systems or devices – Time interval – Gravity actuated type
Patent
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
Miska Vit W.
Youtie Robert K.
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