1st machine is a lab blender-note the metal jar lid-so it could withstand steam autoclaves.
2nd one-very nice-looks like someone bought it then put it away-doesn't even look used.
3rd one-forget it!
I already have #1. It could be both a lab or commercial bar blender.
I have similar to #2 in white enamel
#3 I haven't seen but it look like it has a cheap plastic jar. Something they had made for them elsewhere.
Waring "lab" blenders-Waring is currently the largest producer of blenders for chemestry lab and science use-in fact when I bought a new Waring commercial blender with half-gallon metal jar-In their manual-had something that said like--"if you have to return a container for us to repair and its from a lab-please attach verification that the container has been steam or chemically sterilized-We won't accept blender parts without this notice"Many pharmecy labs and other chem labs used blenders to prepare various types of solutions.And soil sample labs use blenders to prepare or grind soil samples.And you can get "explosion proof" blender motor bases for use in explosive atmospheres or with flammable or hazardous materials.