Logarex 27730 Natural Gas Slide Rule

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Country of manufacture: Czechoslovakia,            Date of manufacture: ____
Overall length: 30.0 cm,          Width: 3.8 cm,           Weight: 108.4 gms
Materials: all plastic
Cursor: 4.8 X 4.7 X 0.7 cms; all plastic, slightly magnifying; lines = three on front
Scales: 8
Front: 25 cm // p_z-p_k, x², p²_z-p²_k [ L, D ], Q, x
Back: Instructions (in Czech); for translation, see here.
Slide Back: Blank
Condition: C2-C3 (Mint to very minimal signs of use)
Came with: Green plastic box/case

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