Chain used for survey work in the recent times is
AGunter's chain
BEngineers chain
CMetric chain
DRevenue chain
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ഇന്ത്യൻ ദേശീയതയുടെ പ്രവാചകൻഎന്നറിയപ്പെടുന്നത് :
A structure constructed at the head entrance of the canal to control the flow of water: