# Relationship history for MSHA mine 4201378

Current hierarchy: **Sauvage Ward → Western Reserve Coal Company Inc → Colombine**

- 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:** Itel Resources Of Utah Inc → Colombine; 1977-04-01 to 1979-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Itel Resources → Colombine; 1977-04-01 to 1979-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Itel Resources → Itel Resources Of Utah Inc; 1977-04-01 to 1979-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Western Reserve Coal Company Inc → Colombine; 1979-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sauvage Ward → Colombine; 1979-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sauvage Ward → Western Reserve Coal Company Inc; 1979-02-05 to current/open; source msha-controller-operator-history