Monroe mechanical calculator (I). July, 2007.
Monroe mechanical calculator (I) [link]Paper  abstract   bibtex   
Enjoy using vintage calculators!. Allways turn the main crank 360º, clockwise for adding (and multiplication) counterclockwise for substraction (and division).
@misc{noauthor_monroe_2007,
	title = {Monroe mechanical calculator ({I})},
	url = {http://www.youtube.com/watch?v=EozhU6rybHY&feature=youtube_gdata_player},
	abstract = {Enjoy using vintage calculators!. Allways turn the main crank 360º, clockwise for adding (and multiplication) counterclockwise for substraction (and division).},
	urldate = {2014-03-27},
	month = jul,
	year = {2007},
}

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