# Relationship history for MSHA mine 4607560

Current hierarchy: **Mc Court Loye → K & C Coal Company Inc → Mine #4**

- 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

- **controller_controls_mine:** Sears Casey & Emery Smallman → Mine #4; 1973-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Court Loye → Mine #4; 1976-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Call-John Coal Company Inc → Mine #4; 1982-11-22 to 1988-12-08; source msha-controller-operator-history
- **operator_operates_mine:** Spring Ridge Coal Company → Mine #4; 1988-08-01 to 1988-12-08; source msha-controller-operator-history
- **controller_controls_operator:** Mc Call-John Coal Company Inc → Spring Ridge Coal Company; 1988-08-01 to 1988-12-08; source msha-controller-operator-history
- **operator_operates_mine:** Taner Coal Company Inc → Mine #4; 1988-12-09 to 1990-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Sears Casey & Emery Smallman → Taner Coal Company Inc; 1988-12-09 to 1990-10-14; source msha-controller-operator-history
- **operator_operates_mine:** K & C Coal Company Inc → Mine #4; 1990-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Court Loye → K & C Coal Company Inc; 1990-10-15 to current/open; source msha-controller-operator-history