# Relationship history for MSHA mine 4605700

Current hierarchy: **Muncy Danny L → Star Buck Coal Inc → No 18**

- 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:** B B C Coal Company Inc → No 18; 1977-08-01 to 1988-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Belcher Wiley → No 18; 1977-08-01 to 1991-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Belcher Wiley → B B C Coal Company Inc; 1977-08-01 to 1988-04-19; source msha-controller-operator-history
- **operator_operates_mine:** B B C Coal Company Inc → No 18; 1988-04-20 to 1989-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Belcher Tommy → No 18; 1988-04-20 to 1989-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Belcher Tommy → B B C Coal Company Inc; 1988-04-20 to 1989-12-13; source msha-controller-operator-history
- **operator_operates_mine:** B B C Coal Company Inc → No 18; 1989-12-14 to 1991-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Belcher Wiley → B B C Coal Company Inc; 1989-12-14 to 1991-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Muncy Danny L → No 18; 1990-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Star Buck Coal Inc → No 18; 1991-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Muncy Danny L → Star Buck Coal Inc; 1991-02-05 to current/open; source msha-controller-operator-history