a wheelock mt with a non ada strobe?!

Fire Alarms
1

hey guys. i was just lookin on ebay and i came across what is an mt4 with the old ws style strobe. is it just me or did wheelock really have the old ws strobe on the MTs before using the ada one?!

take a look:
http://www.ebay.com/itm/WHEELOCK-MODEL-MT4-115-WH-FIRE-ALARM-STROBE/360897765397?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222003%26algo%3DSIC.FIT%26ao%3D1%26asc%3D20643%26meid%3D6065174525085604290%26pid%3D100005%26prg%3D9209%26rk%3D3%26rkt%3D6%26sd%3D350516726211&rt=nc