Tool # 4

It has the spring clip so it must have been pushed or snapped into a holder. The tip in the left end is set into the conical part and is a different metal. Both are magnetic. Maybe it screws or snaps in - no telling. Notice the little tit on the right end. it may be broken off short or worn short.

What part of the country are you in?  It looks kind of like an automatic miner tooth.

Red Bluff/Redding California.

WWII bomb fuse?  Hit it real hard with a hammer to check.

Looks like a digging tooth for trencher.  The very end of the tip may be a different metal than the base part of the tooth.  Could be carbide tipped.  Check it on grinder for hardness and difference in sparks.
Al

Don't have a grinder. I cannot knick the tip with a file edge. The after portion will knick. The file just shines up the tip so it must be quite hard.

I guess there were a couple Japanese balloon fire bombs  up here somewhere - maybe between here and Medford  Or.  Duds.

Here's a Vermeer trencher tooth right off my parts room shelf.   Carbide tip and metal spring clip retainer.

Well that's it then. Thank you. I Googled >trencher teeth< and found one almost identical here

http://www.alibaba.com/product-detail/AUC40KH-25mm-Round-shank-tungsten-carbide_687401174.html?spm=a2700.7724857.29.300.7Urbtz

Quote from: wvtools on April 12, 2016, 06:37:59 PM
What part of the country are you in?  It looks kind of like an automatic miner tooth.

Wow, those miners sure did have big teeth back then.

Quote from: bird on April 13, 2016, 01:40:45 PM

Quote from: wvtools on April 12, 2016, 06:37:59 PM
What part of the country are you in?  It looks kind of like an automatic miner tooth.

Wow, those miners sure did have big teeth back then.

I'm trying to figure out what you do when the "off" switch on your automatic miner gets stuck.  Does it or s/he just keep on digging, emerging on the other side of the Earth?  Or can you pull the battery cables off?

It also looks similar to the teeth on a bobcat planer atachment.