The contractor labour licence is applicable if the contractor have 50 or more labours?

The contractor labour licence is applicable if the contractor have 50 or more labours. Can any one give me the Govt. circular regarding it?
6th February 2018 From India, Nashik

Dear Raul, Please find attached circular which may be helpful to resolve your query.
6th February 2018

Attached Files (Download Requires Membership)

CLA-Notification-01-Maharashtra 50 Empl-05.01.17 (1).pdf (61.8 KB, 197 views)

Any information about Karnataka. Labour licence is applicable for how many number of workmen and more?
9th February 2018 From India, Madras

Any insight for Himachal Pradesh?
2nd July 2018