# Relationship history for MSHA mine 4605036

Current hierarchy: **Charles E H Jr → B & K Coal Inc → No 13**

- 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:** B & K Coal Inc → No 13; 1976-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles E H Jr → No 13; 1976-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles E H Jr → B & K Coal Inc; 1976-02-12 to current/open; source msha-controller-operator-history