# Relationship history for MSHA mine 1504392

Current hierarchy: **Stanford Energy → R & C Processing Company Inc → 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

- **operator_operates_mine:** Triple Elkhorn Mining Company Inc → Surface No 1; 1950-01-01 to 1977-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Ranier Harry Hale → Surface No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ranier Harry Hale → Triple Elkhorn Mining Company Inc; 1950-01-01 to 1977-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Triple Elkhorn Mining Company Inc → Surface No 1; 1977-10-01 to 1983-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Zapata Corp → Surface No 1; 1977-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zapata Corp → Triple Elkhorn Mining Company Inc; 1977-10-01 to 1983-06-30; source msha-controller-operator-history
- **operator_operates_mine:** R & C Processing Company Inc → Surface No 1; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stanford Energy → Surface No 1; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanford Energy → R & C Processing Company Inc; 1983-07-01 to current/open; source msha-controller-operator-history