# Relationship history for MSHA mine 1506991

Current hierarchy: **Cox William A → Rawhide Coal Company → No 1 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:** Rawhide Coal Company Inc → No 1 Mine; 1974-01-01 to 1977-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Collins Bobby Et Al → No 1 Mine; 1974-01-01 to 1977-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Collins Bobby Et Al → Rawhide Coal Company Inc; 1974-01-01 to 1977-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Rawhide Coal Company → No 1 Mine; 1977-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cox William A → No 1 Mine; 1977-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cox William A → Rawhide Coal Company; 1977-03-26 to current/open; source msha-controller-operator-history