# Relationship history for MSHA mine 4503238

Current hierarchy: **Stevenson Thomas M & Michael Bannister → Matco Rock Inc → Indian Creek Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Matco Rock Inc → Indian Creek Pit; 1991-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stevenson Thomas M & Michael Bannister → Indian Creek Pit; 1991-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stevenson Thomas M & Michael Bannister → Matco Rock Inc; 1991-05-01 to current/open; source msha-controller-operator-history