# Relationship history for MSHA mine 4404149

Current hierarchy: **Adkins Delmar E → Cranes Nest River Coal Company → No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Tempest Creek Coal Company Inc → No 1 Strip; 1975-07-08 to 1975-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Isgette Lawrence B → No 1 Strip; 1975-07-08 to 1975-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Isgette Lawrence B → Tempest Creek Coal Company Inc; 1975-07-08 to 1975-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Cranes Nest River Coal Company → No 1 Strip; 1975-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Delmar E → No 1 Strip; 1975-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Delmar E → Cranes Nest River Coal Company; 1975-11-01 to current/open; source msha-controller-operator-history