41 PDU definitions

Protocol Data Unit 
Power Distribution Unit 
Protocol Data Units 
Pilot Display Unit 
packet data unit 
Power Drive Unit 
Pilot's Display Unit 
Power Distribution Units 
Pressure Distribution Unit 
Process Development Unit 
Packet Data Units 
Performance Diagnostic Unit 
Plug Distribution Unit 
Prototype Development Unit 
Pulse Detection Unit 
Package Drop Units 
Panel Display Unit 
Parallel Divider Unit 
Payload Data Unit 
Personnel Dispersal Unit 
Photographic Development Unit 
Physical Data Unit 
Port Data Unit 
Post Docs with Units 
power Doppler ultrasonography 
power Doppler ultrasound 
Power Drive Units 
Prediction and Dispatch Unit 
Premises Distribution Upgrade 
process demonstration unit