Optical Parallels
designed to inspect parallelism and flatness of measuring faces of micrometers
each glass is marked with an identification-number (glued)
ground and polished on both sides
polished...
Bevel Square
for general carpentry and metal work, etc.
steel blade ind carbon or stainless steel, cross section 29 x 1.6 mm
elocated aluminium handle with profile grooves, cross section 30 x 11.5...