# Relationship history for MSHA mine 4403267

Current hierarchy: **Wallen Glenn A → Everglade Coal Corp → 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

- **operator_operates_mine:** B & W Coal Company Inc → Mine No 1; 1950-01-01 to 1974-03-14; source msha-controller-operator-history
- **controller_controls_mine:** B & W Coal Company Inc → Mine No 1; 1950-01-01 to 1974-03-14; source msha-controller-operator-history
- **controller_controls_operator:** B & W Coal Company Inc → B & W Coal Company Inc; 1950-01-01 to 1974-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Glenwood Mining Corp → Mine No 1; 1974-03-15 to 1976-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Wallen Glenn A → Mine No 1; 1974-03-15 to 1976-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Wallen Glenn A → Glenwood Mining Corp; 1974-03-15 to 1976-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Valley Fork Corp → Mine No 1; 1976-07-15 to 1986-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Stacy Jack → Mine No 1; 1976-07-15 to 1986-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Stacy Jack → Valley Fork Corp; 1976-07-15 to 1986-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Everglade Coal Corp → Mine No 1; 1986-02-15 to 1986-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Thrower Monroe → Mine No 1; 1986-02-15 to 1986-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Thrower Monroe → Everglade Coal Corp; 1986-02-15 to 1986-10-16; source msha-controller-operator-history
- **operator_operates_mine:** Everglade Coal Corp → Mine No 1; 1986-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wallen Glenn A → Mine No 1; 1986-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wallen Glenn A → Everglade Coal Corp; 1986-10-17 to current/open; source msha-controller-operator-history