spray arm question

[rpm]

I was in Sears today and saw a bottom of the line Kenmore but it had a 3 armed wash arm in the bottom. Like the Kitchen Aid minus one. Have these been around for awhile?

 

[appnut]

Since Sears BOL dishwasher are made by Frigidaire, AND Frigidaire had some models with 3-arm washerms in the bottom, tit's a Frigidaire and has beena round for 3 or 4 years.