The following are screwdriver examples which I would like to purchase or borrow for study and photographing:
 

           

 

There may be no maker marks on this tool.

          

 

  

 

 

 

 

This may be the only marking or may have other markings related to Gilbert T. Sutterly, Philadelphia.
 

 

This is another form of the Sutterly patent above. This may be the only marking or may have other markings related to Gilbert T. Sutterly, Philadelphia.