Interesting artifacts from the past:

http://bertan.gipuzkoakultura.net/es/16/en/6.php

http://www.thefirearmblog.com/blog/2011/07/05/key-guns/

http://www.oobject.com/category/jailers-key-guns/

Some batons were also shotguns. Look-a-like pens were constructed to shoot 25s and 32s
And we're not talking about spy stuff. you could reacquisition these. The batons were common in the late 30s, I believe, until the early 60s.

The Iron Claw was used to clamp down on a prisoners mandible to either shut them up or stop them from spitting - that's why nippers aren't made any more. A few officers "got out of hand" with their use. Flashlights were outfitted with pepper-spray and tazers.
Now some flashlights "smell" alcohol. There are new bullet-proof clipboards that "smell" alcohol too.

But yeah, those are neat keys. Sometimes I wish I had something like that when going to my warehouse at night. Either that or a wicked flash pot.

One of the key guns appeared on Pawn Stars. Not a very useful item as it had to have a wick they needed to light the wick then wait for it to ignite the powder.