| 摘要 |
A concave cutter bit which has a bit body that contains a concavity in the axially forward end thereof. A plurality of cutter inserts are brazed to the bit body at the periphery of the open end of the concavity. The cutter inserts are spaced apart in such a fashion so that a gap exists between adjacent cutter inserts that is of sufficient size to prevent the formation of a continuous braze joint between any adjacent cutter inserts.
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