# Relationship history for MSHA mine 4405041

Current hierarchy: **Griffey Bob → T J & M Coal Company Inc → Mine 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

- **controller_controls_mine:** Boshell Harry E → Mine No 1; 1976-11-01 to 1978-10-27; source msha-controller-operator-history
- **operator_operates_mine:** Boshell Coal Company → Mine No 1; 1978-01-01 to 1978-10-27; source msha-controller-operator-history
- **controller_controls_operator:** Boshell Harry E → Boshell Coal Company; 1978-01-01 to 1978-10-27; source msha-controller-operator-history
- **operator_operates_mine:** Boshell Coal Company → Mine No 1; 1978-10-28 to 1980-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Hibbitts David E → Mine No 1; 1978-10-28 to 1980-04-07; source msha-controller-operator-history
- **controller_controls_operator:** Hibbitts David E → Boshell Coal Company; 1978-10-28 to 1980-04-07; source msha-controller-operator-history
- **operator_operates_mine:** T J & M Coal Company Inc → Mine No 1; 1980-04-08 to 1982-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Tommy Joe  Owens → Mine No 1; 1980-04-08 to 1982-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Tommy Joe  Owens → T J & M Coal Company Inc; 1980-04-08 to 1982-08-08; source msha-controller-operator-history
- **operator_operates_mine:** T J & M Coal Company Inc → Mine No 1; 1982-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Griffey Bob → Mine No 1; 1982-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Griffey Bob → T J & M Coal Company Inc; 1982-08-09 to current/open; source msha-controller-operator-history