# Relationship history for MSHA mine 3605640

Current hierarchy: **Donald R  Rebuck → M & R Coal Company → No 2 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:** M & R Coal Company → No 2 Slope; 1975-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald R  Rebuck → No 2 Slope; 1975-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald R  Rebuck → M & R Coal Company; 1975-01-01 to current/open; source msha-controller-operator-history