Wolverine Sign Works is an Owosso outdoor-advertising business associated with billboard structures and sign services. Its company history dates its founding to 1916 and identifies Ralph Vosburg and J. Gratz Cook as its founders.[1]
History to document
This short article is a starting point for a fuller company history. Further research will document:
- The development of the Bradley Street premises.
- Changes in sign construction and outdoor-advertising technology.
- The company’s workers, ownership and community connections.
References
- 1. Wolverine Sign Works: outdoor advertising and company history ↗. Wolverine Sign Works. Accessed October 30, 2026.
Source-reviewed encyclopedia entry.