Fort Missoula, for nearly a century a military fort, is now a National Historic Place and park. In the park are a few of the pre 20th century buildings from the original 1877 fort and many buildings from the early 1900s. They have an eclectic collection of large artefacts, including machinery and tractors, a lookout tower, railroad engine and cars, a tipi burner, the old Drummond, MT RR station, an old school and an old mission, artillery and a historical museum. It's a great place to spend an afternoon or a whole day.
Under cover in the long pole barn, if you can find the Holt 75 crawler you can find this Auto Patrol. Introduced in 1931, the
Auto Patrol was almost immediately replaced (renamed, actually) by the No. 9 Auto Patrol, which, in turn was replaced shortly by the No. 7 Auto Patrol. This was the first self propelled grader produced by Caterpillar and ostensibly used the same engine as the Cat Twenty crawler, a 4.5 Litre 4-cyl gasoline engine of about 30 HP. This grader has serial number 6D35 and engine number 9A601.