The Elite looks to be an early 15 clone made in Japan. There is a thread about them at
Will the Real 15 clone please stand up I say it is an early as there is not a knob to lower the feed dogs. There is a manual for the 15 clone machines at
https://ismacs.net/singer_sewing_mac...ion-manual.pdf There is another at
https://www.manualslib.com/manual/10...Morse-200.html Both have the feed drop knob on the bed. I'm not sure if the feed dogs can be dropped like a Singer 15-90 machine as seen at
https://www.manualslib.com/manual/18...page=35#manual
The Minnesota looks like the one in this thread
https://www.quiltingboard.com/vbulle...e-t276831.html I'm thinking the post about the needles at
Need help identifying Sears Minnesota treadle sewing machine would apply to your machine. One of my posts about Minnesota A machine can be found at
Need help identifying Sears Minnesota treadle sewing machine Minnesota machines were sold by Sears, but some were made by companies other than Davis (Davis made yours). The link at
https://ismacs.net/sears/sears.html tells of the Sears machines.
Janey - Neat people never make the exciting discoveries I do.
Not affiliated with off-site link(s)
ETA - There are some that think the clones are as good as Singers and maybe even be better.