# Relationship history for MSHA mine 1506982

Current hierarchy: **Fields Mason & Larry Ratliff → L & M Coal Company Inc → 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:** Joyce Coal Co → No 1 Mine; 1974-01-01 to 1974-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Joyce Coal Co → No 1 Mine; 1974-01-01 to 1974-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Joyce Coal Co → Joyce Coal Co; 1974-01-01 to 1974-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Metternick Coal Corp → No 1 Mine; 1974-09-02 to 1975-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Triplett John → No 1 Mine; 1974-09-02 to 1975-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Triplett John → Metternick Coal Corp; 1974-09-02 to 1975-11-07; source msha-controller-operator-history
- **operator_operates_mine:** L & M Coal Company Inc → No 1 Mine; 1975-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fields Mason & Larry Ratliff → No 1 Mine; 1975-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fields Mason & Larry Ratliff → L & M Coal Company Inc; 1975-11-08 to current/open; source msha-controller-operator-history