In what duration we inspect tempreture of mines? | tempreture ki jaanch kab karte hai??

Ø 1^st degree :– prataike 30 din me kam se kam 1 baar(at least 1 time inspection is done by competent person, in every 30 days).

  Ø   2^nd or 3^rd degree :– prataike 14 din me kam se kam 1 baar.