# Relationship history for MSHA mine 2300465

Current hierarchy: **Associated Electric Cooperative Inc → Associated Electric Cooperative Inc → Aeci - Mining Division**

- 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:** Peabody Coal Company → Aeci - Mining Division; 1950-01-01 to 1977-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Kennecott Copper Corp → Aeci - Mining Division; 1950-01-01 to 1977-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Kennecott Copper Corp → Peabody Coal Company; 1950-01-01 to 1977-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Aeci - Mining Division; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peabody Coal Company → Aeci - Mining Division; 1977-07-01 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Peabody Coal Company; 1977-07-01 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Associated Electric Cooperative Inc → Aeci - Mining Division; 1978-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Associated Electric Cooperative Inc → Aeci - Mining Division; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Associated Electric Cooperative Inc → Associated Electric Cooperative Inc; 1980-01-01 to current/open; source msha-controller-operator-history