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Fillet Brazing
From WikiPedalia
A process in which frame tubes are brazed directly to one another, without the use of lugs. The "fillet" (pronounced "fill-it") is the strip of brass melted along the seam to connect the steel parts. The fillet is usually filed smooth, so that the tubes seem to flow smoothly into one another with no sharp transitions.
See also Mike Rother's article on Fillet-Brazed Schwinns on this site.
