| 摘要 |
PCT No. PCT/GB92/00199 Sec. 371 Date Sep. 15, 1993 Sec. 102(e) Date Sep. 15, 1993 PCT Filed Feb. 3, 1992 PCT Pub. No. WO92/14346 PCT Pub. Date Aug. 20, 1992.The invention provides an entry board for use adjacent a printed circuit board during drilling therethrough comprising a drill lubricant distributed over the entry board. The board may comprise two or more separable laminar components (A, B) one of which has the drill lubricant. There is also provided a composite entry or backing board for use adjacent a printed circuit board during drilling therethrough, in which the adjacent faces of two laminar components of the entry or backing board are joined such that there is no relative slip during transportation, cutting and positioning, and they are separable by peeling them apart after use. |
