# Relationship history for MSHA mine 4405760

Current hierarchy: **Walker John → Waw Coal Company Inc → No 1 Mine**

- 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:** Crystal Enterprises Inc → No 1 Mine; 1981-10-01 to 1982-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Herman Jerry → No 1 Mine; 1981-10-01 to 1982-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Herman Jerry → Crystal Enterprises Inc; 1981-10-01 to 1982-08-01; source msha-controller-operator-history
- **operator_operates_mine:** L F & E Coal Company Inc → No 1 Mine; 1982-08-02 to 1983-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Mullins White Jr & James D Mc Intyre → No 1 Mine; 1982-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins White Jr & James D Mc Intyre → L F & E Coal Company Inc; 1982-08-02 to 1983-12-18; source msha-controller-operator-history
- **operator_operates_mine:** M & T Coal Company Inc → No 1 Mine; 1983-12-19 to 1984-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Burley Et Al → No 1 Mine; 1983-12-19 to 1984-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Burley Et Al → M & T Coal Company Inc; 1983-12-19 to 1984-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Double T Coal Corp → No 1 Mine; 1984-07-12 to 1985-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Trosper Betty → No 1 Mine; 1984-07-12 to 1985-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Trosper Betty → Double T Coal Corp; 1984-07-12 to 1985-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Waw Coal Company Inc → No 1 Mine; 1985-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walker John → No 1 Mine; 1985-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walker John → Waw Coal Company Inc; 1985-10-15 to current/open; source msha-controller-operator-history