# Relationship history for MSHA mine 4606143

Current hierarchy: **Marsh William → Apt Consultants Inc → Surface 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:** Nellis Mining Company Inc → Surface Mine No 1; 1980-04-01 to 1981-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Basic American Industries → Surface Mine No 1; 1980-04-01 to 1981-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Basic American Industries → Nellis Mining Company Inc; 1980-04-01 to 1981-01-15; source msha-controller-operator-history
- **operator_operates_mine:** Red Robin Coal Company Inc → Surface Mine No 1; 1981-01-16 to 1983-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Wright Lovia Lee → Surface Mine No 1; 1981-01-16 to 1983-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Wright Lovia Lee → Red Robin Coal Company Inc; 1981-01-16 to 1983-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Lockhart John W → Surface Mine No 1; 1983-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H C M Coal Company Inc → Surface Mine No 1; 1983-12-02 to 1984-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Hartman H H → Surface Mine No 1; 1983-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hartman H H → H C M Coal Company Inc; 1983-12-02 to 1984-05-31; source msha-controller-operator-history
- **operator_operates_mine:** H C M Coal Company Inc → Surface Mine No 1; 1984-06-01 to 1986-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Ramey Tim → Surface Mine No 1; 1984-06-01 to 1986-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Ramey Tim → H C M Coal Company Inc; 1984-06-01 to 1986-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Middle Fork Corp → Surface Mine No 1; 1986-01-15 to 1986-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Lockhart John W → Middle Fork Corp; 1986-01-15 to 1986-09-07; source msha-controller-operator-history
- **operator_operates_mine:** Kacey-Dawn Inc → Surface Mine No 1; 1986-09-08 to 1988-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Arnold Don → Surface Mine No 1; 1986-09-08 to 1988-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Arnold Don → Kacey-Dawn Inc; 1986-09-08 to 1988-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Apt Consultants Inc → Surface Mine No 1; 1988-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marsh William → Surface Mine No 1; 1988-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marsh William → Apt Consultants Inc; 1988-01-22 to current/open; source msha-controller-operator-history