General Motors Corp.

This is a petition by a self insurer for leave to appeal late from a final decree of the Superior *482Court in a workmen’s compensation case. G. L. c. 214, § 28 (as amended through St. 1960, c. 207, § 2). It was correctly stipulated before the single justice that the failure seasonably to appeal was due to the fact that the petitioner had received no notice of the entry of the decree, and that this constituted “mistake or accident or other sufficient cause” within the meaning of § 28. See Liberty Mut. Ins. Co., petitioner, 298 Mass. 75, 77. The only issue raised was whether “any genuine questions…