[Oa] "OA" From The Interesting Patent Department

[Ken & Diane Neely]

I came across these interesting 60+ year old patents.  Just out of
curiosity, any concepts look familiar?

www.google.com/patents?vid=USPAT2415501&id=XLRqAAAAEBAJ&pg=PP1&dq=swing+card#PPP1,M1

www.google.com/patents?vid=USPAT1841041&id=pHpsAAAAEBAJ&pg=PP1&dq=patent:1841041&as_drrb_ap=q&as_minm_ap=1&as_miny_ap=2007&as_maxm_ap=1&as_maxy_ap=2007&as_drrb_is=q&as_minm_is=1&as_miny_is=2007&as_maxm_is=1&as_maxy_is=2007#PPP1,M1

www.google.com/patents?vid=USPAT565450&id=TbdlAAAAEBAJ&printsec=abstract&zoom=4&dq=565450#PPA5,M1

www.google.com/patents?vid=USPATRE22109&id=2fUWAAAAEBAJ&pg=PA9&dq=2205262