Building Construction
The piece of a brick cut with its one corner equivalent to half the length and half the width of a full brick, is known as

Half king closer
Queen closer
Bevelled closer
King closer

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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
Hinders the ground water observations and permeability test
All listed here

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