Mannheim and multiplex slide rules; theory and practical application : Rosenthal, Leon Walter : Free Download & Streaming. 1905.
Mannheim and multiplex slide rules; theory and practical application : Rosenthal, Leon Walter : Free Download & Streaming [link]Paper  bibtex   
@book{noauthor_mannheim_1905,
	title = {Mannheim and multiplex slide rules; theory and practical application : {Rosenthal}, {Leon} {Walter} : {Free} {Download} \& {Streaming}},
	shorttitle = {Mannheim and multiplex slide rules; theory and practical application},
	url = {https://archive.org/details/mannheimmultiple00roserich},
	urldate = {2014-03-25},
	year = {1905},
}

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