Obviously, in many locations there is no available power source, and so a portable

Obviously, in many locations there is no available power source, and so a portable fax machine must have its own batteries. But it may be that salespeople and others often use the fax machine in their car; therefore it could use in-car power, telephone and USB sockets. Other aspects of performance that emerge is that the fax machine might well be required to operate as a stand-alone multi-purpose machine, offering scanning and printing functions as well as sending and receiving voice and data messages.


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