# Relationship history for MSHA mine 4606204

Current hierarchy: **Dawson Karl R Iii → Srj Energy Inc → Keg No 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:** Cheyenne Development Company → Keg No 1; 1980-08-01 to 1981-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Marra Louis E → Keg No 1; 1980-08-01 to 1981-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Marra Louis E → Cheyenne Development Company; 1980-08-01 to 1981-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Guidi Gary → Keg No 1; 1981-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Sky Coal Sales Inc → Keg No 1; 1981-12-07 to 1982-02-06; source msha-controller-operator-history
- **controller_controls_operator:** Guidi Gary → Blue Sky Coal Sales Inc; 1981-12-07 to 1982-02-06; source msha-controller-operator-history
- **operator_operates_mine:** Keg Coal Company → Keg No 1; 1982-02-07 to 1984-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Petitte James → Keg No 1; 1982-02-07 to 1984-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Petitte James → Keg Coal Company; 1982-02-07 to 1984-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Dawson Karl R Iii → Keg No 1; 1984-06-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Srj Energy Inc → Keg No 1; 1984-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dawson Karl R Iii → Srj Energy Inc; 1984-09-19 to current/open; source msha-controller-operator-history