The maximum measured output impedance was 0.16 ohms, at 20kHz into a 4 ohm load, this decreasing to less than 0.1 ohm at 1kHz. This is not unusually low for a solid-state amplifier, but low enough that any effect on the amplifier's frequency response with a real load will be small.
The History of American Girl Dolls and Pleasant Company and changes in Book Illustrations. Pleasant Company began in 1986 in Middleton, Wisconsin. The company was founded by Pleasant T. Rowland, a woman who used to be a teacher and a publisher of educational texts. Rowland sold Pleasant Company in 1998 to Mattel. Pleasant Company is now legally called American Girl. The first catalogue contained only 3 historical dolls, whereas now there are 10 (not counting the new addition of the best friends dolls).
Pleasant Rowland introduced American Girl dolls in 1986 as a historically-themed alternative to Barbie and the Cabbage Patch Kids. Since 1998 her firm has been owned by the maker of both rival dolls, #1 toy manufacturer Mattel. American Girl produces the American Girls Collection of 18-inch, high-dollar dolls, including Addy (an escaped slave) and Rebecca Rubin (a young Jewish immigrant).