# Relationship history for MSHA mine 3304025

Current hierarchy: **James F  Graham → Buckingham Mining & Reclamation → Buckingham**

- 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:** Buckingham Mining & Reclamation Inc → Buckingham; 1985-08-01 to 1994-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Gary L  Allen → Buckingham; 1985-08-01 to 1994-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Allen → Buckingham Mining & Reclamation Inc; 1985-08-01 to 1994-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Buckingham Mining & Reclamation → Buckingham; 1994-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James F  Graham → Buckingham; 1994-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James F  Graham → Buckingham Mining & Reclamation; 1994-04-01 to current/open; source msha-controller-operator-history