@misc{noauthor_how_2013-2,
	title = {How to use, multiply and divide, a {Madas} calculator with authomatic division},
	url = {http://www.youtube.com/watch?v=lvG1zI_1hJI&feature=youtube_gdata_player},
	abstract = {http://www.antiguedadestecnicas.com - This vintage calculator is a MADAS manufactured in Switzerland in 1913. It is a historic machine, a real icon in the history of 20th century arithmometers. The name MADAS is composed of the initials of the functions this machine can perform.  In German, Multiplicier, Automat Dividieren, Addieren, Subtrahieren; In English, Multiplication, Automatic Division, Addition, Substraction. MADAS. The automatic division function was the bigger innovation that these models included, a real novelty for the time. Thanks to this function the user can performs divisions automatically, just turning the crank until he or she hears the bell that indicates the end of the operation.},
	urldate = {2013-12-09},
	month = jun,
	year = {2013},
}

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