US1715246-drawings-figure-2RelatedPatent Drawing of Engine - US2172670- Figure 2 Public domain imagePatent Drawing of Engine - 2140946 SWARTZ drawing - . Public domain imageDrawing (USA) (CH 18140249) - Drawing. Public domain image.Drawing (USA) (CH 18140305) - Public domain drawingUS787412-0 - Figure 2Drawing (USA), 1845 (CH 18194387-2)MoreUS1715246-drawings-figure-2file_downloadDownloadcrop_originalOrder Printrate_reviewdescriptionSummary duplex front fork systemUser:MichaelFrey/US1715246label_outlineTagspatent drawingsunited statesduplex front fork systemusptotechnical drawingpatent applicationdate_rangeDate21/05/1928createSourceWikimedia CommonslinkLinkhttp://commons.wikimedia.org/copyrightCopyright infoPublic Domain