{HEAD ~ A platform} rides up and down {TAIL ~ the frame side leg guide channels} in response to the raising and lowering of the lower arms such that a one foot rise in the platform results in a three foot rise in the platform relative to ground levcel 
rides up
{ HEAD ~ A platform } rides up and down { TAIL ~ the frame side leg guide channels } in response to the raising and lowering of the lower arms such that a one foot rise in the platform results in a three foot rise in the platform relative to ground levcel
HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH