# Relationship history for MSHA mine 3607709

Current hierarchy: **Brian R  Rich → Schuylkill Reclamation Corp → Boardwalk Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Schuylkill Reclamation Corp → Boardwalk Strip; 1985-07-01 to 1986-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Mearns Andrew K → Boardwalk Strip; 1985-07-01 to 1986-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Mearns Andrew K → Schuylkill Reclamation Corp; 1985-07-01 to 1986-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Schuylkill Reclamation Corp → Boardwalk Strip; 1986-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brian R  Rich → Boardwalk Strip; 1986-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian R  Rich → Schuylkill Reclamation Corp; 1986-01-14 to current/open; source msha-controller-operator-history