Curved Glass:
I can't contribute anything beyond my own experience, but I do have personal knowledge of curved glass dating from before this Easy would have been made. When I was a kid, one of my mom's prized possessions was a Victorian-era desk with a glass-front bookcase. The bookcase was beside the drop-leaf desk (which had drawers beneath it), and it was maybe five feet tall, total (the entire piece was seven feet tall or so). The bookcase's door was curved, and the glass in it was, too. Sometime in '56 or '57, the piece fell over onto its face (probably from Mom overloading the drop-leaf for the desk), and so the original glass had to be replaced. Anyway, producing curved glass was evidently a possibility as early as the turn of the 20th century, when that piece was produced. And the replacement curved glass was available at the local level in the '50s, so it must not have been a huge deal, maybe a little hard to get, but still something a housewife could locate and order. However, it was not safety glass of any kind, and that probably made a huge difference.
Sad coda: We had a house fire in early '59, and this time the desk/bookcase was damaged beyond restoration, mostly by water from the fire-fighting efforts. Too bad; it was a very handsome piece, with dragon heads holding up the shelves above the desk.