# Relationship history for MSHA mine 4605447

Current hierarchy: **Hall Clyde → C & E Coal Company → No 2**

- 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:** Massey Energy Company → No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Trace Fork Coal Company → No 2; 1977-01-01 to 1982-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Trace Fork Coal Company; 1977-01-01 to 1982-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Roy L  McCoy et al → No 2; 1977-11-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Extractors Inc → No 2; 1982-09-02 to 1987-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Roy L  McCoy et al → Extractors Inc; 1982-09-02 to 1987-05-14; source msha-controller-operator-history
- **operator_operates_mine:** C & E Coal Company → No 2; 1987-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall Clyde → No 2; 1987-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Clyde → C & E Coal Company; 1987-05-15 to current/open; source msha-controller-operator-history