# Relationship history for MSHA mine 4404466

Current hierarchy: **Branham Carroll → Interstate Mining & Equipment Company Inc → No 11 Dock**

- 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:** United  Company → No 11 Dock; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → No 11 Dock; 1976-03-01 to 1979-05-20; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1976-03-01 to 1979-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Childers Walt C → No 11 Dock; 1979-05-01 to 1981-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Carol Coal Co Inc Of Tazewell County Va → No 11 Dock; 1979-05-21 to 1980-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Childers Walt C → Carol Coal Co Inc Of Tazewell County Va; 1979-05-21 to 1980-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Wolford Lonnie W → No 11 Dock; 1980-02-12 to 1982-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Hope Coal Company → No 11 Dock; 1980-03-06 to 1981-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Wolford Lonnie W → Hope Coal Company; 1980-03-06 to 1981-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Mining & Equipment Company Inc → No 11 Dock; 1981-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Branham Carroll → No 11 Dock; 1981-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Branham Carroll → Interstate Mining & Equipment Company Inc; 1981-07-01 to current/open; source msha-controller-operator-history