What are these Snap On sockets for?

[NJ Marty]

Looks like a 1930 date code but not sure. I looked through some period catalogs and cant find these. Maybe these are later than 1930. Thanks for any help.

 

[NJ Marty]

One more picture.

 

[no704]

Must be for working on Bosch power tools!

 

[ChefRex]

Don’t know but I sorta like them, lol.

 

[NYBODYMAN]

They look industrial but I have no clue of course.

 

[Steven 33]

I gotta look again I found a reference somewhere on them after seeing on ebay