Five of the six have been answered correctly:

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351. 20Q game, (twenty questions)

352. head stack from a hard disk drive

353. This one hasn't been answered correctly, it's made of aluminum and is
hollow.

354. Vacuum bazooka

355. Saxaphone

356. It was marked as being one of a pair of tree climbers.

Several links and more photos have been posted on the answer page:

http://pzphotosan62rt.blogspot.com/