# Relationship history for MSHA mine 4603756

Current hierarchy: **Beasley Industries Inc & John Mc Call Coal Co Inc → Spring Ridge Coal Company → No 11 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

- **controller_controls_mine:** Beasley Industries Inc & John Mc Call Coal Co Inc → No 11 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Webster Coal Company Inc → No 11 Mine; 1950-01-01 to 1975-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Varner John → No 11 Mine; 1950-01-01 to 1975-07-17; source msha-controller-operator-history
- **controller_controls_operator:** Varner John → Webster Coal Company Inc; 1950-01-01 to 1975-07-17; source msha-controller-operator-history
- **operator_operates_mine:** Spring Ridge Coal Company → No 11 Mine; 1975-07-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beasley Industries Inc & John Mc Call Coal Co Inc → Spring Ridge Coal Company; 1975-07-18 to current/open; source msha-controller-operator-history