# Relationship history for MSHA mine 3303913

Current hierarchy: **Thomas M  Hull; Michael P  Carlow → Sme Minerals Inc → Archer Pit**

- 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:** Compher James → Archer Pit; 1977-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Archer Mining & Construction Company Inc → Archer Pit; 1982-09-01 to 1985-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Compher James → Archer Mining & Construction Company Inc; 1982-09-01 to 1985-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Sme Minerals Inc → Archer Pit; 1985-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael P  Carlow et al → Archer Pit; 1985-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael P  Carlow et al → Sme Minerals Inc; 1985-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas M  Hull et al → Sme Minerals Inc; 1985-05-14 to current/open; source msha-controller-operator-history