Baby Sitting Up in Photo Frame (PHT_0151)

Nothing on the back of actual photo or on the frame. The photography studio is on the front of the frame:
Kendall and Genter
5138 YORK BLVD.
LOS ANGELES

Sailor in Uniform (PHT_0150)

Nothing on the back.

Young Boy Holding Truck and Has Wavy Hair (PHT_0148)

Nothing on the back.

Little Boy Outside on Grass (PHT_0149)

Faint writing on the back. It looks like the name Sid, so it could be Sidney Allen Bowers.

Young Girl Sitting in Wicker Chair (PHT_0147)

Nothing on the back.

Young Man (PHT_0146)

On the back is written two numbers:
197
198 [which is crossed out]

Tintype Photo of Young Child (PHT_0064)

Difficult to read, but on the back is engraved:
Dal--
-3

Note: Dashes indicate the letters/numbers that I am unable to read.