# Relationship history for MSHA mine 3605469

Current hierarchy: **Nardei Carl G → Utilco Inc → Nardei 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:** Sager Coal Company → Nardei Strip; 1950-01-01 to 1975-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Sager Coal Company → Nardei Strip; 1975-02-12 to 1975-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Sager Coal Company → Sager Coal Company; 1975-02-12 to 1975-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Utilco Inc → Nardei Strip; 1975-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nardei Carl G → Nardei Strip; 1975-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nardei Carl G → Utilco Inc; 1975-03-25 to current/open; source msha-controller-operator-history