# Relationship history for MSHA mine 4404156

Current hierarchy: **Mc Call Sam → Mac-Pat Coal Corp → Surface No 1**

- 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

- **controller_controls_mine:** Mc Call Sam → Surface No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vance Coal Company → Surface No 1; 1975-06-01 to 1977-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Vance Ershell C → Surface No 1; 1975-06-01 to 1977-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Vance Ershell C → Vance Coal Company; 1975-06-01 to 1977-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Mac-Pat Coal Corp → Surface No 1; 1977-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Call Sam → Mac-Pat Coal Corp; 1977-04-29 to current/open; source msha-controller-operator-history