# Relationship history for MSHA mine 0800269

Current hierarchy: ** → Clark Site Contractors, Inc. → PENSACOLA MINE AND PLANT**

- 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

- **operator_operates_mine:** Clark Site Contractors, Inc. → PENSACOLA MINE AND PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John R  Clark  et al → PENSACOLA MINE AND PLANT; 1992-03-01 to 1996-08-09; source msha-controller-operator-history
- **controller_controls_operator:** John R  Clark  et al → Clark Site Contractors, Inc.; 1992-03-01 to 1996-08-09; source msha-controller-operator-history