Hi

What do the abbreviations mean?

link

BeoVision LX 5000

EDT 4227 (1992 - March 1993) 
ETA 4225 (1992 - Feb 1993) 
ETS 4226 (1992 - Feb 1993) 
GDT 4223 (1992 - Apr 1993) 
GNS 4279 (1992 - Mar 1993) 
MDE 4228 (1992 - Apr 1993) 
MDS 4273 (1992 - Feb 1993) 
MDT 4221 (1992 - Feb 1993) 
MIS 4282 (1992 - May 1992) 
MST 4220 (1992 - May 1993) 
MTI 4224 (1992 - Mar 1992) 
MTS 4270 (1992 - Dec 1996) 

BeoVision LX 5000 mk2

EDT 3374 (1992 - May 1995) 
ETS 3373 (1992 - Apr 1995) 
GDT 3363 (1992 - May 1995) 
MDS 3367 (1992 - Jan 1995) 
MDT 3361 (1992 - Mar 1995) 
MIS 3372 (1992 - May 1994) 
MST 3360 (1992 - May 1995) 
MTA 3365 (1992 - May 1994) 
MTI 3364 (1992 - Jan 1995) 
MTS 3366 (1992 - Apr 1995) 
MVT 3376 (1992 - Jan 1995) 

BeoVision 6000

EDS 4258 (1992- Mar 1993) 
EDT 4207 (1992 - Mar 1993) 
ETA 4205 (1992 - Aug 1992) 
ETS 4206 (1992 - Jan 1993) 
GDT 4203 (1992 - Nov 1992) 
GNS 4249 (1992 - Jan 1993) 
MDS 4243 (1992 - Jan 1993) 
MDT 4201 (1992 - Jan 1993) 
MS 4252 (1992 - May 1992) 
MST 4200 (1992 - Feb 1993) 
MTI 4204 (1992 - Feb 1993) 
MTS 4240 (1992 - Sep 1992) 

BeoVision 6000 mk2

EDT 3354 (1992 - May 1996) 
ETS 3353 (1992 - Feb 1996) 
GDT 3343 (1992 - Mar 1996) 
GNS 3349 (1992 - Mar 1996) 
HKN 3342 (1993 - May 1996) 
MDS 3347 (1992 - Feb 1996) 
MDT 3341 (1992 - May 1996) 
MIS 3352 (1992 - Nov 1995) 
MST 3340 (1992 - May 1996) 
MTA 3345 (1992 - Feb 1995) 
MTI 3344 (1992 - May 1996) 
MTS 3346 (1992 - Feb 1996) 
MVT 3356 (1993 - May 1996) 
UCP 3358 (1993 - May 1996)

I have been trying to guess some of them. Of course I also googled them. But it doesn't make sense. Are the abbreviations time zones? Like:

EDT = Eastern Daylight Time

MDT = Mountain Daylight Time

Any help will be appreciated.

Thank you