GE Dishwasher
This is the same dishwasher my parents had, that replaced their Modern Maid, only it was a built-in model.
They bought it in 1973 and it had a light green lined plastisol interior, with darker green coated racks.
It was a sterling performer, but after about 7 to 8 years it started to develop some rust spots, in the tub.
On the control panel, it stated "2 Speed." Ha. It had the normal one speed motor. Once, when the GE repairman was there, he and I were laughing at GE's stretching of the truth, a little.
When one pushed the "China and Crystal" buttone on the control panel, a little valve opened which let air enter an oblong black tube that went from the control panel down the inside of the door and underneath the dishwasher where it entered the pump.
The repairman said this "aereated the water" and softened the force of the water on the dishes. He also stated the aereated water, having less force, caused the wash arm to turn more slowly, hence GE could say the unit was two speed.
In reality, I could never hear a difference in the wash action nor the rotation of the wash arm when that button was pressed. It may have aereated the water, a little, and maybe the arm turned more slowly, a little, but I think most of the benefit was in the user's mind. hehe
Nevertheless, it was a great machine, and after we had it a few days, my mom proclaimed, "I didn't think a dishwasher could be this good!"