# Relationship history for MSHA mine 1510602

Current hierarchy: **Plunkett Dean → Bo Valley Energy Corp → No 1 Surface**

- 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

- **controller_controls_mine:** Astleford Melvin G → No 1 Surface; 1977-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M G A Of Kentucky Inc → No 1 Surface; 1977-08-01 to 1978-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Astleford Melvin G → M G A Of Kentucky Inc; 1977-08-01 to 1978-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Bo Valley Energy Corp → No 1 Surface; 1978-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Plunkett Dean → No 1 Surface; 1978-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Plunkett Dean → Bo Valley Energy Corp; 1978-03-02 to current/open; source msha-controller-operator-history