Circular Slide Rule

Loga Circular Slide Rule
Marking: Loga Uster - Schweiz
Type: Tt
Year: ca. 1960
Size: 16 x 16 x 3 cm
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References

[1]

Loga Calculator AG

Gebrauchsanweisung - Vom Rechenschieber zur Rechen-Scheibe. Uster (ca. 1950).

[2]

Loga Calculator AG

Loga 30 Tt / 360° - Short Instructions. Uster (ca. 1960).