The basic question presented on this petition for enforcement is whether there was substantial evidence to support the Board’s findings. Without in any way departing from our rule that the burden of producing evidence, as distinguished from speculation, is on the Board, e. g., NLRB v. Millard Metal Service Center, Inc., 1 Cir., 1973, 472 F.2d 647; Cross Baking Co. v. NLRB, 1 Cir., 1971, 453 F.2d 1346, respondent’s criticism of the Board’s decision, 198 N.L.R.B. No. 30 (1972), cannot be viewed as of that nature. Respondent’s over-extensive briefing recites evidence which might have warranted a different result, but it does not require us to reject the evidence on which the Board relied, or the inferences it reasonably drew therefrom.

The order will be enforced.