# Relationship history for MSHA mine 3602948

Current hierarchy: **Stanford Energy → Doverspike Brothers Coal Company → Eagle Strips**

- 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:** Doverspike Brothers Coal Company → Eagle Strips; 1950-01-01 to 1976-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Doverspike Brothers Coal Company → Eagle Strips; 1950-01-01 to 1976-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Doverspike Brothers Coal Company → Doverspike Brothers Coal Company; 1950-01-01 to 1976-01-09; source msha-controller-operator-history
- **operator_operates_mine:** Doverspike Brothers Coal Company → Eagle Strips; 1976-01-10 to 1983-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Zapata Corp → Eagle Strips; 1976-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zapata Corp → Doverspike Brothers Coal Company; 1976-01-10 to 1983-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Doverspike Brothers Coal Company → Eagle Strips; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stanford Energy → Eagle Strips; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanford Energy → Doverspike Brothers Coal Company; 1983-07-01 to current/open; source msha-controller-operator-history