61 PTM definitions

Proof/Test Model 
Pulse Time Modulation 
Packet Transfer Mode 
Please Tell Me 
PARTSMASTER 
Pulse Time Multiplex 
Packet Transport Mode 
Path Trace Mismatched 
Point-To-Multipoint 
post-translational modification 
Programmable Timer Module 
Project Team Manager 
Packaged Trunk Module 
Packet Type Multiplexing 
Pageless Tech Manual 
Pageless Technical Manual 
Paint The Night 
pan/tilt mount 
Parent Teacher Meeting 
Partially Transmitted Message 
Participating Transaction Manager 
Passenger Transportation Module 
Pennsylvania Test Methods 
Perceptual Template Model 
Performance Test Model 
Peripheral Trace Memory 
peripheral transition module 
Permanent Timetable Manager 
Personnel Transport Module 
perturbation trajectory method