# Relationship history for MSHA mine 4402752

Current hierarchy: **Adkins Thelma → K & T Coal Company → No 1 Mine**

- 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:** Sharron Coal Company Inc → No 1 Mine; 1950-01-01 to 1975-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Mc Clanahan Donald Keith → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Clanahan Donald Keith → Sharron Coal Company Inc; 1950-01-01 to 1975-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Chambers Charles H → No 1 Mine; 1974-06-01 to 1976-12-06; source msha-controller-operator-history
- **operator_operates_mine:** Triple C Coal Co Inc → No 1 Mine; 1975-09-11 to 1976-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Chambers Charles H → Triple C Coal Co Inc; 1975-09-11 to 1976-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Sherman & Estil → No 1 Mine; 1976-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Amtrak Coal Company Inc → No 1 Mine; 1976-12-07 to 1977-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Tester Jimmie → No 1 Mine; 1976-12-07 to 1977-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Tester Jimmie → Amtrak Coal Company Inc; 1976-12-07 to 1977-07-24; source msha-controller-operator-history
- **operator_operates_mine:** A & A Coal Company Inc → No 1 Mine; 1977-07-25 to 1979-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Sherman & Estil → A & A Coal Company Inc; 1977-07-25 to 1979-03-11; source msha-controller-operator-history
- **operator_operates_mine:** K & T Coal Company → No 1 Mine; 1979-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Thelma → No 1 Mine; 1979-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Thelma → K & T Coal Company; 1979-03-12 to current/open; source msha-controller-operator-history