Actually it's the "Manufacturer Code" ...
-100 Technicolor (Thomson/Audiovox/RCA)
-200 Samsung
-300 Philips
-400 Hughes
-500 Humax
-600 LG
-700 Pace
-800 NEC
Your point is well taken though, but for brevity sake many just regularly leave it off since there should be no difference between the manufacturers of the same revision of an equipment....
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