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Pattern: South Bend (Miller-Knoblock / Knoblock-Heidman) · Test: Osceola
The pattern is a firm that survives a technology change by changing product — wagons, then magnetos — and so bridges two eras of a roster. Tested against Osceola's roster era bands (to 1869 / 1870–89 / 1890–1909 / 1910–29 / 1930–89 / 1990–present): no Osceola firm in the record reached crosses a band boundary with a changed product. The mill succession crosses bands only by changing owners, not products; the creamery line is a naming, not a succession (the Martin family firm of 2017 against Crystal Springs Creamery Co. of the 1916–17 census — DELTA DF-24 keeps their datings unmerged); and the 1930–89 band, where a bridging firm would most likely sit, prints empty by design (AF-O6-5), which caps the test's strength and is printed with it. Tested negative at roster strength, with the empty band named as the test's limit.
Named gap: any bridging firm inside the 1930–89 band — settler: the directory classified runs of item 9, which are the only instrument that can see into that band.
Sources: Businesses (banked roster bands and creamery articles); DELTA DF-24; SEC11 AF-O6-5.