Spg definitions

SPG

Single-point ground
Found on http://www.encyclo.co.uk/visitor-contributions.php

---

SPG

self-propelled gun
Found on http://www.translationdirectory.com/glossaries/glossary262.php

---

SPG

Sync pulse generator. A source of synchronization pulses.
Found on http://www.zoo.co.uk/~z0001325/Glossary.html

---