# Relationship history for MSHA mine 3607981

Current hierarchy: **Michael  Rothermel; John  Scheib → Summit Coal Company → Summit 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:** Summit Coal Company → Summit Slope; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Scheib et al → Summit Slope; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Scheib et al → Summit Coal Company; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Rothermel et al → Summit Coal Company; 1988-01-01 to current/open; source msha-controller-operator-history