National Microscope Model T0.5A 4/10/40x Lenses

NATIONAL...MODEL #111 MICROSCOPE with 3 Objectives 4x 10x 40x

National Model 131 Electric Microscope *Works* WF10X-18MM

National Microscope Model 138 Monocular Compound w/ 4x, 10x, 40x Objectives, LED

National Monocular Microscope 4x 10x 40x Objectives LED Model 210?

National Optical Model 131-CLED Monocular Compound LED Microscope 4x, 10x, 40x

National Model 138 Monocular Microscope w/ 4x, 10x, & 40x Objectives 48 slides

National Model 131 Compound Microscope WF10x 20W Illuminated Tested Working