Rule 18, Delhi Mines and Minerals (Development and Regulation) Act, 1957 (Licensing) Rules, 2013 [S3D-9G4]
As at 7 September 2026. In force from 13 March 2013.
Periodical returns.—Every patentee shall furnish to the Registrar, within sixty days of the close of each year, a return in Form 27 of the working of a patent carried on during that year, and a nil return where no such activity was carried on.
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