# Relationship history for MSHA mine 1514710

Current hierarchy: **Dean Charles E → Dean Fuel Company → #1 Surface**

- 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:** Rim Rock Mining Inc → #1 Surface; 1984-07-01 to 1986-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Bingham Glenn → #1 Surface; 1984-07-01 to 1986-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Bingham Glenn → Rim Rock Mining Inc; 1984-07-01 to 1986-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Dean Fuel Company → #1 Surface; 1986-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dean Charles E → #1 Surface; 1986-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dean Charles E → Dean Fuel Company; 1986-10-01 to current/open; source msha-controller-operator-history