Wearable radio frequency sensors that emit light, sound and/or vibration alerts, comprised of, sensors, integrated circuit chips, transmitters, receivers, and cases therefor, for monitoring the distance between people for social distancing and contact tracing

'alert':11 'and/or':9 'case':21 'chip':17 'circuit':16 'compris':12 'contact':33 'distanc':26,31 'emit':6 'frequenc':3 'integr':15 'light':7 'monitor':24 'peopl':28 'radio':2 'receiv':19 'sensor':4,14 'social':30 'sound':8 'therefor':22 'trace':34 'transmitt':18 'vibrat':10 'wearabl':1

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