# Relationship history for MSHA mine 1502260

Current hierarchy: **Benjamin R.  Bennett → B S B Coal Company Inc → K O K 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:** Champion International Corporation → K O K Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K O K Coal Company → K O K Mine; 1950-01-01 to 1973-03-20; source msha-controller-operator-history
- **controller_controls_mine:** K O K Coal Company → K O K Mine; 1950-01-01 to 1973-03-20; source msha-controller-operator-history
- **controller_controls_operator:** K O K Coal Company → K O K Coal Company; 1950-01-01 to 1973-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Harlan No 4 Coal Company → K O K Mine; 1973-03-21 to 1981-09-02; source msha-controller-operator-history
- **controller_controls_operator:** Champion International Corporation → Harlan No 4 Coal Company; 1973-03-21 to 1981-09-02; source msha-controller-operator-history
- **operator_operates_mine:** B S B Coal Company Inc → K O K Mine; 1981-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin R.  Bennett → K O K Mine; 1981-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin R.  Bennett → B S B Coal Company Inc; 1981-09-03 to current/open; source msha-controller-operator-history