# Relationship history for MSHA mine 3607010

Current hierarchy: **Buterbaugh Arthur J → A & T Coal Company Inc → Furman Strip**

- 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

- **controller_controls_mine:** Buterbaugh Arthur J → Furman Strip; 1976-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A & T Coal Company Inc → Furman Strip; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buterbaugh Arthur J → A & T Coal Company Inc; 1980-08-01 to current/open; source msha-controller-operator-history