# Relationship history for MSHA mine 4404922

Current hierarchy: **Keene Jack R → Brookie Coal Company Inc → 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:** Justus Timothy Et Al → No 1; 1975-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Maynard Larry → No 1; 1977-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fair Day Coal Company Inc → No 1; 1977-12-01 to 1979-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Maynard Larry → Fair Day Coal Company Inc; 1977-12-01 to 1979-11-07; source msha-controller-operator-history
- **operator_operates_mine:** Cloverleaf Mining Company Inc → No 1; 1979-11-08 to 1980-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Keen Elmer → No 1; 1979-11-08 to 1980-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Keen Elmer → Cloverleaf Mining Company Inc; 1979-11-08 to 1980-11-06; source msha-controller-operator-history
- **operator_operates_mine:** Dyna Carb Coal Company Inc → No 1; 1980-11-07 to 1981-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Justus Timothy Et Al → Dyna Carb Coal Company Inc; 1980-11-07 to 1981-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Colorado Coal Company Inc → No 1; 1981-02-26 to 1981-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Hickson Calvin W → No 1; 1981-02-26 to 1981-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Hickson Calvin W → Colorado Coal Company Inc; 1981-02-26 to 1981-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Colorado Coal Company Inc → No 1; 1981-03-27 to 1983-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Altizer Tom → No 1; 1981-03-27 to 1983-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Altizer Tom → Colorado Coal Company Inc; 1981-03-27 to 1983-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Little D Coal Company Inc → No 1; 1983-03-30 to 1986-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Keene Dorothy → No 1; 1983-03-30 to 1986-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Keene Dorothy → Little D Coal Company Inc; 1983-03-30 to 1986-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Brookie Coal Company Inc → No 1; 1986-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keene Jack R Et Al → No 1; 1986-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keene Jack R Et Al → Brookie Coal Company Inc; 1986-07-16 to current/open; source msha-controller-operator-history