The master blade is a flexible spatula. It is not sharpened, but the bottom edge is about half as thick as the top. The other blades include a pen and a corkscrew.
I think the corkscrew was for removing a true cork stopper from a medicine bottle or vial.
The spatula was used to measure powdered medicinals from bottles and then to blend them into compounds, in addition to the uses described above, such as separating and counting pills. I cringe at the tongue depressor option. Surely not.
Charlie Noyes