# Relationship history for MSHA mine 3101875

Current hierarchy: **Wm A  Calton; James L  Deck → Calton & Deck → Green River Mine**

- 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:** Calton & Deck → Green River Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wm A  Calton  et al → Green River Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wm A  Calton  et al → Calton & Deck; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L  Deck  et al → Calton & Deck; 1979-01-01 to current/open; source msha-controller-operator-history