Section 311. Unless the employe or someone is his behalf, or some of the dependents or someone in their behalf, shall give notice of disability to the employer liable for compensation under this article, within twenty-one days after compensable disability begins, no compensation shall be due until such notice be given, and unless such notice be given within one hundred and twenty days after the beginning of compensable disability no compensation shall be allowed.
(311 amended Feb. 28, 1956, P.L.1095, No.355)