# Relationship history for MSHA mine 3607435

Current hierarchy: **Barrett Orren S → Barrett Coal Company → Slope No 2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Barrett Orren S Et Al → Slope No 2; 1981-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Barrett Coal Company → Slope No 2; 1983-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barrett Orren S Et Al → Barrett Coal Company; 1983-02-01 to current/open; source msha-controller-operator-history