# Relationship history for MSHA mine 2301701

Current hierarchy: **Associated Electric Cooperative Inc → Nemo Coal Inc → Nemo Coal Inc**

- 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:** Nemo Coal Inc → Nemo Coal Inc; 1978-03-01 to 1985-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Riley Floyd E → Nemo Coal Inc; 1978-03-01 to 1985-12-30; source msha-controller-operator-history
- **controller_controls_operator:** Riley Floyd E → Nemo Coal Inc; 1978-03-01 to 1985-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Nemo Coal Inc → Nemo Coal Inc; 1985-12-31 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Union Pacific Corp → Nemo Coal Inc; 1985-12-31 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Union Pacific Corp → Nemo Coal Inc; 1985-12-31 to 1988-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Nemo Coal Inc → Nemo Coal Inc; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Associated Electric Cooperative Inc → Nemo Coal Inc; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Associated Electric Cooperative Inc → Nemo Coal Inc; 1989-01-01 to current/open; source msha-controller-operator-history