IWA 0432 Building Heat Requirements Slide Rule according to DIN 4701

Country of manufacture: Germany,            Date of manufacture: ____
Overall length: 22.1 cm,          Width: 4.0 cm,           Weight: 45.8 gms
Materials: all plastic, duplex type, two slides on front and back
Cursor: 4.0 X 4.8 X 0.9 cms; all plastic;     lines = one line each on front and back
Scales: 15
Front: b (h) [ a, Δt ] [k (Δk), Z ] [QO, QT
Back: H, m³/h je m [ a, m³/h je m, Δt ] [ R, L ] QL
Gauge Marks: [      ]
Condition: C0 (Mint w/all extras)
Came with: original black plastic slipcase, Instruction manual (German), Information card