# Relationship history for MSHA mine 5001115

Current hierarchy: **Alaska Electric Light & Power Company → Alaska Electric Light & Power Company → Salmon Creek Pit**

- 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:** Hanson & Mann Construction → Salmon Creek Pit; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Hanson & Mann Construction → Salmon Creek Pit; 1950-01-01 to 1979-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Hanson & Mann Construction → Hanson & Mann Construction; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Alaska Electric Light & Power Company → Salmon Creek Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alaska Electric Light & Power Company → Salmon Creek Pit; 1979-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alaska Electric Light & Power Company → Alaska Electric Light & Power Company; 1979-04-01 to current/open; source msha-controller-operator-history