Electronic Match Output

Number:70a

Maker:John Davis & Son Dubilier
PHOTO

Type:Electronic

Length:25 cm

Circular:

Special Scales in Well:N

Special Scales on Stock:Y

Gauge Marks:N

Scales Front:Special Scales = V A = B C = D

Scales Back: S L T

Info: David Rance Collection
OEM by A.G. Thornton but retailed by Davis - copyrighted design by Philip Ray Coursey whilst working for Dubilier Condenser Company.
A later version of the almost identical Thornton Capacity Slide Rule Version 2.