I see three Solo Rex saws, the Solo Rex with the red starter cover could be a 'Super Rex'?....The yellow demo saws, McCulloch PM-1000 ?? Are re-badged Jonsereds / Partner P-100's.
The other yellow saw on the right of the pic is a Canadian, could be a Canadian 270?
The small red saw in the back ground could be a later Jonsereds.
The other older looking saw on the right, with the open rear handle could be a Blue steak?