11.   Fraport staff use portable X-ray machines to scan luggage early.

12.   He started asking other passengers to help him find an electrical outlet for a portable breathing machine, but no one responded.

13.   I am no fan of on-line manuals, but they make sense for portable machines that get carried far from the printed information.

14.   It may be post-Christmas bargain time for desktop computer buyers, but not for executives browsing the PC market for portable machines.

15.   It is the only company with this capability since neither Microsoft or Sony have a portable game machine.

16.   Lucky for them, the plug on new home headphones can be inserted into a standard Walkman jack or connected to most any other portable sound machine.

17.   One official said preliminary analysis of the debris is handled by portable machines that occasionally indicate positive signs of explosive chemicals when, in fact, none are present.

18.   Portable machines still command a premium over their desktop counterparts, but the difference is increasingly small.

19.   Portable X-ray machines scan suspicious luggage.

20.   So what would be the maximum possible energy available to a portable machine?