Building Construction
The dimensions of a half queen closer, are

9 cm × 4.5 cm × 9 cm
9 cm × 9 cm × 4.5 cm
1.8 cm × 4.5 cm × 9 cm
9 cm × 9 cm × 9 cm

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Building Construction
Rotary drilling

Is not economical for holes of less than 10 cm
Is not suitable for deposits containing very coarse gravel
All listed here
Hinders the ground water observations and permeability test

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