NASA NTRS · 19730000126
Intensive care alarm system
Abstract
Inductive loop has been added to commercially available call system fitted with earphone receiver. System transmits high frequency signals to nurse's receiver to announce patient's need for help without disturbing others.
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Christensen, J. L., Herbert, A. L.. 1973-05-01. Intensive care alarm system. https://ntrs.nasa.gov/citations/19730000126
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