# Relationship history for MSHA mine 1201916

Current hierarchy: **Philip E  Haehl → Shelby Gravel Inc → Shelby Gravel Incorporated-Boggstown Roa**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Philip E  Haehl → Shelby Gravel Incorporated-Boggstown Roa; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wheeler Corp → Shelby Gravel Incorporated-Boggstown Roa; 1983-09-01 to 1992-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Wheeler Michael J → Shelby Gravel Incorporated-Boggstown Roa; 1983-09-01 to 1992-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Wheeler Michael J → Wheeler Corp; 1983-09-01 to 1992-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Shelby Gravel Inc → Shelby Gravel Incorporated-Boggstown Roa; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip E  Haehl → Shelby Gravel Inc; 1992-04-01 to current/open; source msha-controller-operator-history