From the right,
1. Turbo Rat ( s/n: RT-10**** / Motorola LM308N chip / Made in U.S.A.)
2. Turbo Rat ( s/n: RT-12**** / Motorola LM308N chip / Made in U.S.A.)
3. Turbo Rat ( s/n: TR-1041** / Texas Instruments OP07DP chip / Made in U.S.A.)
4. Turbo Rat ( s/n: TR-1048** / Texas Instruments OP07DP chip / Made in U.S.A.)
5. Rat2 (s/n: RT-20**** / National LM308N chip / Made in U.S.A. / modified by FATBOY? / Several capacitors upgraded, two diodes were replaced with LED.)