# Relationship history for MSHA mine 3606619

Current hierarchy: **Rhen Clyde P & Kenneth L Koehler → K & R Coal Company → Diamond Slope**

- 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

- **controller_controls_mine:** Adams Esmeralda A → Diamond Slope; 1975-01-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & R Mining Inc → Diamond Slope; 1978-03-01 to 1982-03-02; source msha-controller-operator-history
- **controller_controls_operator:** Adams Esmeralda A → D & R Mining Inc; 1978-03-01 to 1982-03-02; source msha-controller-operator-history
- **operator_operates_mine:** K & R Coal Company → Diamond Slope; 1982-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rhen Clyde P & Kenneth L Koehler → Diamond Slope; 1982-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rhen Clyde P & Kenneth L Koehler → K & R Coal Company; 1982-03-03 to current/open; source msha-controller-operator-history