Slide mount
 A slide mount comprises two substantially identical frame halves which are snap-fitted together. Each frame half has four interlocking elements which lock the frame halves together and each interlocking element comprises a semi-cylindrical male projection and a complementary semi-cylindrical female recess whereby the frame halves are interlocked by the male portions of each half engaging in the female recesses of the other half. 
Bellman & Co. K.G.
G
G03B
inventional
Herbert Heinz
Meyer Schienagel