Status so far:

296. No correct answer yet.
297. I would agree that this is most probably a crack weeder, the owner said
that there was dirt on it when he got it.
298. Still not sure about this one, the owner did mention that it's cheaply
made, with flimsy rivets.

The rest were all answered correctly by at least one person.

299. Straight razor, a photo of the entire item can be seen he

http://pzphotosan56.blogspot.com/

300. Fire syringe, also called a fire piston. I think that specifically the
glass and clear plastic versions are referred to as syringes.

301. Telephone lineman's splicing clamp


Rob