In The Archives Somewhere
Believe "Super" forum we had a long discussion/thread about MS and her laundry room at Skylands. Thread was started by "Moi" with a link to the same or similar blog as above.
Long story short Martha Stewart purchased the estate complete with much of the original furniture and furnishing. This included many of the older appliances you see in that laundry room and tons of vintage linens. The estate was built by and for one of the Ford boys. Not sure if it was the son or grandson. Anyway if one recalls they sold it on to another family who sold it to MS.
Just off the laundry room/servants pantry area is a vast storage for all those vintage (and one assumes by now modern) linens. There are tablecloths original to the estate rolled and stored on special built-in rollers.
The "antique" equipment includes those drying cabinets (built to order and installed at that time), the American Motex extractor, those wash sinks, the ironer (Simplex) near the window, those heavy cast iron base ironing boards, etc...
There was no way any of her servants were ironing sheets on those small ironers. Well you could but they would have to be folded or run through several times. Either way the results surely wouldn't have been up to MS's standards. So those poor servants probably hand ironed all large flatwork on that big table.