Vintage meat saws

Above, E.C. Atkins.  The handle does not appear to be original.

Above, "Universal."  This was a trademark of the West Haven Manufacturing Company.

Above, maker unknown.

Above, Henry Boker.

Finally, "Challenge Canada."  Again, I can't find any information on this manufacturer.

From a time when butchers used to saw up the cow by hand.  I actually didn't realize what these were for until someone identified one for me.