# Relationship history for MSHA mine 1511694

Current hierarchy: **B W  McDonald → Colonial Coal Company Inc → Bishop No 1**

- 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:** Slick Rock Coal Company Inc → Bishop No 1; 1978-11-01 to 1981-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Hunt Raymond → Bishop No 1; 1978-11-01 to 1991-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Hunt Raymond → Slick Rock Coal Company Inc; 1978-11-01 to 1981-02-24; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → Bishop No 1; 1980-10-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bishop Coal Company Inc → Bishop No 1; 1981-02-25 to 1985-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Bishop George → Bishop No 1; 1981-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bishop George → Bishop Coal Company Inc; 1981-02-25 to 1985-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Mc Coy Caney Coal Company → Bishop No 1; 1985-01-15 to 1989-02-14; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Mc Coy Caney Coal Company; 1985-01-15 to 1989-02-14; source msha-controller-operator-history
- **controller_controls_mine:** B W  McDonald → Bishop No 1; 1988-10-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Colonial Coal Company Inc → Bishop No 1; 1989-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B W  McDonald → Colonial Coal Company Inc; 1989-02-15 to current/open; source msha-controller-operator-history