-510 Telecommunications Service and Equipment
-520 Telephone Services [128 Kb]
-530 Facsimile Transmission [60 Kb]
-540 Voice Radio Systems [77 Kb]
-550 Diplomatic Telecommunications Service [56 Kb]
-560 Tactical Satellite Communications [92 Kb]
-570 Television Services and Equipment [113 Kb]
-580 Wireless Information Technology [120 Kb]
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