# Relationship history for MSHA mine 1510473

Current hierarchy: **Belt Norman L → Belt Excavating Company → Guess Trucking Mine 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Guess Roy M → Guess Trucking Mine No 2; 1976-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Guess Trucking & Construction Company Inc → Guess Trucking Mine No 2; 1977-03-01 to 1981-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Guess Roy M → Guess Trucking & Construction Company Inc; 1977-03-01 to 1981-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Belt Excavating Company → Guess Trucking Mine No 2; 1981-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Belt Norman L → Guess Trucking Mine No 2; 1981-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Belt Norman L → Belt Excavating Company; 1981-10-16 to current/open; source msha-controller-operator-history