Mear Domestic Central Heating Calculator, Model 4D

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Country of manufacture: England,            Date of manufacture: ____
Diameter: 19.6 cm,      Weight: 182.0 gms
Materials: all plastic
Scales: numerous, specialty
Front
     Outer Disk:
     Inner Disk:
     Cursor:
Back
     Outer Disk:
     Inner Disk:
Condition: C2 (Mint but no manual)
Came with: Red plastic slipcase w/snap closure

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