# Relationship history for MSHA mine 4405726

Current hierarchy: **Tommy N  Bright I → Cheyenne Processing Company Inc → Cheyenne #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Elite Coals Inc → Cheyenne #1; 1981-08-01 to 1985-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Bright Tommy N-Carter C Long Et Al → Cheyenne #1; 1981-08-01 to 1985-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Bright Tommy N-Carter C Long Et Al → Elite Coals Inc; 1981-08-01 to 1985-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Cheyenne Processing Company Inc → Cheyenne #1; 1985-01-14 to 1992-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Ricky D  Kirk  et al → Cheyenne #1; 1985-01-14 to 1992-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Ricky D  Kirk  et al → Cheyenne Processing Company Inc; 1985-01-14 to 1992-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Cheyenne Processing Company Inc → Cheyenne #1; 1992-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tommy N  Bright I → Cheyenne #1; 1992-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tommy N  Bright I → Cheyenne Processing Company Inc; 1992-02-13 to current/open; source msha-controller-operator-history