In the early 1900s the Linneman Hearse Factor on North Buchanan just south of the Maryville Electric complex built motorized hearses.
Here are articles:
The hearse company originally started as a carriage company in 1900 at 310 North Main. 1900 OCR: J. LINNEMAN, Carriage and Buggy Repairing and Painting. All work is promptly done and guaranteed. 310 NORTH MAIN STREET. https://www.newspapers.com/article/the-maryville-daily-forum-linneman-carri/187917713/
1908 OCR: SHIPS COSTLY HEARSE FRIDAY The Linneman hearse factory of this city made a shipment of a hearse on Friday, which was purchased by McGregor & Babbitt. Undertakers of Creston, Iowa, for $750. Every bit of the work on the hearse. Except for some silver filigree work! It was done in the Linneman shops on North Buchanan Street. Three months were consumed in building the vehicle, which is by far the handsomest ever turned out here. Instead of the usual glass panes, carved wood panels were used, with a pleasing effect. The drapery relief work in the panels is beautiful, as are the carved lilies and drapery cords. Mr. Linneman did the carving himself. Mr. Linneman is working on a less expensive hearse, which will soon be shipped to F. L. Wetmore of Blanchard, Iowa.
https://www.newspapers.com/article/the-maryville-daily-forum-linneman-hears/187920829/
Linneman sold the property in 1911 and moved to California. Here is his 1934 obituary when he was 64. He would have been in early 30s when he operated the motorized hearse business. 1934 OCR: John Linneman, Former Resident, Dies in West. Word has been received here by Herman and J. W. Linneman of the death Saturday of their uncle, John Linneman, at his home in Watsonville, Cal. Mr. Linneman lived in Maryville until about twenty years ago. He worked in a carriage factory during his residence in Maryville. Mr. Linneman was about 64 years old. The funeral and burial were in California. Mrs. Linneman died about two years ago. Nine sons, all of whom live in California, survive. A brother, Ed Linneman, lives in Omaha, Neb., and a sister, Mrs. Clara Wagner, lives in Butler, Mo. https://www.newspapers.com/article/the-maryville-daily-forum-obituary-for-j/187917532/