Every production marque, one by one — and none of them this ground's

ROW 4 · BOUNDARY WHOLE; GROUND TESTED NEGATIVE

The business leg's test was a plant-of-scale test, and the audit is right that an early small marque would slip it; this article runs the marque test by name. For the ground: no production automobile marque — no motor-buggy factory, no costliest-car venture, no unit-power-plant works or renamed continuation — was ever seated in Clay or Harris townships in the marque registers, directories, or press record reached. For the county, the marques are South Bend's, and they print one by one:

Studebaker (South Bend, 1902–1963; Hamilton, Ontario, to 17 March 1966 in the marque record — 5 March 1966 in one register summary; the December 1963 South Bend closing is the date this ground's course turns on, and the final Canadian date prints in its two forms unmerged). Founded as a wagon house in 1852 (above); first motor vehicle the electric runabout of 1902 (1,841 electrics built to 1912); gasoline cars from 1904; fully Studebaker-manufactured gasoline cars marketed from August 1912 in the register's dating; one of America's leading independent makers through the 1920s (sales past $100 million in 1922); receivership 18 March 1933 and recovery under Hoffman and Vance; the low-priced Champion (1939); postwar firsts and decline; merger with Packard (1954) into Studebaker-Packard; the Lark reprieve; South Bend automobile production ended December 1963 — the last South Bend Avanti, serial R-5643, on 31 December in the register's account, against the corporation record's 20 December line-stop date, printed as the sources give them — and the name continued as a Canadian product and then a diversified corporation (Studebaker-Worthington, 1968) after car-making ended.

Studebaker-Garford (1904–1911). The premium assembled line: Garford of Elyria, Ohio, supplied complete chassis; Studebaker built the bodies in South Bend and sold the cars at a premium under the joint name. Seven years, 2,481 gasoline passenger cars and trucks in Erskine's accounting of the Garford-pattern years — the county's first gasoline marque was, in manufacture, half Ohio's.

E-M-F and Flanders (Detroit, 1908–1912) print in the assembled-elsewhere article; they are South Bend–sold marques, never South Bend–built, and are not double-counted here. Erskine (1926–1930) likewise prints there. Rockne (1932–1933), the line named for Notre Dame's Knute Rockne, is carried at pointer size on the marque record reached (the county survey's mention), its whole course belonging to South Bend's own automobiles leg. Avanti / Avanti II (1962– ) is the continuation: Studebaker's fiberglass grand tourer, launched April 1962, whose production rights and South Bend plant passed at the 1963 closing to Nate Altman, who continued the car in South Bend as the Avanti II — the county's one renamed continuation, and a South Bend story entire.

The roll is the finding. A county that built one of America's great marques, two assembled joint lines, a Detroit satellite pair, and a post-closure continuation built none of them in its northeastern townships — not the giant, and not a single small venture the plant-of-scale test could have missed. The marque map of St. Joseph County has one city on it.

Sources:

1. Studebaker marque register record (carzlover / register summaries from Bonsall, More Than They Promised, Stanford, 2000, and Erskine, History of the Studebaker Corporation, 1924) — the timeline as printed, including its internal date variants, flagged in the text.
2. Erskine, History of the Studebaker Corporation (archive.org) — the electric and gasoline firsts; the Garford-pattern production figures; the 1911 corporation's absorption of E-M-F.
3. University of Michigan, Automobile in American Life record (autolife.umd.umich.edu) — Studebaker summary: wagons to 1920, electrics 1902, gasoline 1904, Packard merger, production end 1966.