# Relationship history for MSHA mine 4607607

Current hierarchy: **Toler Rodney → Contour Coal Inc → Contour #1**

- 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 & C Bituminous Mining Inc → Contour #1; 1988-10-01 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Dehart Virgil Et Al → Contour #1; 1988-10-01 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Dehart Virgil Et Al → B & C Bituminous Mining Inc; 1988-10-01 to 1990-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Contour Coal Inc → Contour #1; 1990-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Toler Rodney → Contour #1; 1990-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Toler Rodney → Contour Coal Inc; 1990-08-01 to current/open; source msha-controller-operator-history