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Material of construction of surveying metallic tapes is __________ which has low coefficient of expansion & enough strength.

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Question: Material of construction of surveying metallic tapes is __________ which has low coefficient of expansion & enough strength.
[A].

constantan

[B].

invar

[C].

pewter metal

[D].

monel metal

Answer: Option B

Explanation:

No answer description available for this question.