Modular, portable data collection terminals are disclosed for use in mixed wireless and hard-wired RF communication networks, wherein various radio transmitter modules and associated antennas may be selectively added to a base terminal unit to solve networking problems associated with specific types...http://www.google.fr/patents/US7383038?utm_source=gb-gplus-shareBrevet US7383038 - Modular, portable data processing terminal for use in a radio frequency communication network
Modular, portable data processing terminal for use in a radio frequency ...
