Comparison of E.R.M to SIAM Rear Suspensions

Was wandering internet sites working on H-Mod history.  Looking at the pictures on Cliff Reuter’s website again:

http://www.cliffreuter.com/etceterinihomepage.htm

Specifically page on ERM or E.R.M

http://www.cliffreuter.com/etceterinihmodcarscliffreuter.htm#ERM.

I noticed the rear suspension is very similar to the SIAM rear suspension; lever friction shocks, cantilever rear spring, etc.  Was wondering if there is a connection? Anyone help here?

Did ERM have front friction shocks also?

Comparison ERM with SIAM rear susepnsion