# Relationship history for MSHA mine 4200085

Current hierarchy: **Groves S J & Sons Company → Western States Minerals Corp → J B King 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Sun Valley Coal Co → J B King Mine; 1950-01-01 to 1975-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Sun Valley Coal Co → J B King Mine; 1950-01-01 to 1975-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Sun Valley Coal Co → Sun Valley Coal Co; 1950-01-01 to 1975-07-01; source msha-controller-operator-history
- **operator_operates_mine:** Western States Coal Corp → J B King Mine; 1975-07-02 to 1976-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Heiner Claude → J B King Mine; 1975-07-02 to 1976-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Heiner Claude → Western States Coal Corp; 1975-07-02 to 1976-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Western States Minerals Corp → J B King Mine; 1976-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Groves S J & Sons Company → J B King Mine; 1976-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Groves S J & Sons Company → Western States Minerals Corp; 1976-04-05 to current/open; source msha-controller-operator-history