# Relationship history for MSHA mine 3607850

Current hierarchy: **Witmer Kenneth → Mountain View Coal Company → R & S 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

- **operator_operates_mine:** Mountain View Coal Company → R & S Slope; 1986-12-01 to 1989-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Barnhart Ronald Et Al → R & S Slope; 1986-12-01 to 1989-06-04; source msha-controller-operator-history
- **controller_controls_operator:** Barnhart Ronald Et Al → Mountain View Coal Company; 1986-12-01 to 1989-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Mountain View Coal Company → R & S Slope; 1989-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Witmer Kenneth Et Al → R & S Slope; 1989-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Witmer Kenneth Et Al → Mountain View Coal Company; 1989-06-05 to current/open; source msha-controller-operator-history