Ace Rug & Carpet Cleaning is long gone from Brooklyn; the current occupant of the address in this 1940s ad is a Pentecostal church. I bet that cute Brooklyn baby snagged them lots of business. Anyone know why “defender” is the local telephone exchange?
This is actually a cardboard ink blotter, a necessity back in the age of leaky pens. You used it to blot runaway ink instead of letting the ink gunk up whatever you were writing. Every household had tons of them, as they were distributed free by businesses as an advertising vehicle.