I'm trying to figure out what all the crossover techs are, and I'm coming up blank on a couple.  Here's what I've got so far:
O-C:  BioCrystaline Armor
O-P:  Telepathic Armor
O-T:  Temporal Cloning
O-R:  Drop Pod
C-P:  P. Stun Crystal
C-T:  Harmonic Shields
C-R:  Healing Crystal
P-T:  The huge bonus combat sensors I can't remember the name of  
 
 
P-R:  ????????
T-R:  Spirit Crew Quarters
Am I way off base on any of these?  Can/will anyone tell me what the P-R crossover tech is?
Thanx in advance for all your help!