I have seen some similar to this in use as a part of a cartridge activated device.
Some were used to start engines, some open latches,some bigger ones to eject things.

Have you looked up starter cartridge?

http://www.simpsonltd.com/product_info.php?products_id=20074

http://www.easy39th.com/files/TM_9-1731_Breeze_Cartridge_Starter_for_Radial_Diesel_Engines_1942.pdf

Do you have a cardboard box for them with an AN number? Looks like a social security number of sorts.
The AN numbering system was the father to the current NSN numbering system for milirary parts.

Mike

Last edited by skeettx; 04/26/12 10:05 PM.
USAF RET 1971-95 [Linked Image from jpgbox.com]