Signal apparatus
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United States of America Patent
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Dec 18, 1990
Grant Date -
N/A
app pub date -
Dec 4, 1989
filing date -
Dec 4, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A signal apparatus comprising a post-mountable arm adapted at one end to be mounted on a vertical stand post and having provided at the other end thereof a bell adapted to be struck by a counter-weight mounted on one end of a balance beam when blood reaches a predetermined level in a blood collection bag hung from the other end of the balance beam which is mounted on the said post below the said arm, and a hook adapted to receive a second bag removably hung thereon.
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