Revolving Surface-Planer. Rudolph, J. H. .
Revolving Surface-Planer [link]Paper  bibtex   
@patent{rudolph_revolving_nodate,
	title = {Revolving {Surface}-{Planer}},
	url = {https://patents.google.com/patent/US397568A/en?q=slate&q=planer&oq=slate+planer},
	urldate = {2018-01-24},
	author = {Rudolph, J. H.}
}
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