The AA-11/R-73 becomes public around 1986 (DoD) and the Phyton 3 becomes public around 1987 (Aerosalon).~1990 R-73 were handed to Israel for testing by Germany. The Phyton 4 from 90s is what we compare with the R-73+. In the 90s the development started of the “R-30”, the successor of the R-73+ and Israel worked for the Phyton 5, which had just entered service now. We can asume to a fair degree, that every lot of AAM incorporates some improvements. The first built Phyton 4 differs from the last one produced over some years. Most of it internal. Where buys Israel the propellant for the rocket-motor? We can assume to a fair degree that some goodies from other countries will find its way into every AAM.