1
Rod L Proctor, Andrew J Rimkus: Facility and method for tracking physical assets. Airbiquity, Stoel Rives, September 2, 2003: US06614349 (281 worldwide citation)

A communication module for an asset to be monitored operates to periodically receive a signal from a monitoring facility via a first wireless communication system, and in response to the absence of the signal at an expected time, communicating with the module via a second wireless system. The first ...


2
Rod L Proctor, Andrew J Rimkus: Facility and method for tracking physical assets. Airbiquity, fu jianjun, December 11, 2002: CN00813786

A communication module for an asset to be monitored operates to periodically receive a signal from a monitoring facility via a first wireless communication system, and in response to the absence of the signal at an expected time, communicating with the module via a second wireless system. The first ...