# Relationship history for MSHA mine 4403229

Current hierarchy: **United  Company → Rapoca Energy Company → Shop**

- 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:** Black Watch/Black Diamond Coal Corp → Shop; 1950-01-01 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Fields Resources Inc → Shop; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fields Resources Inc → Black Watch/Black Diamond Coal Corp; 1950-01-01 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_mine:** W R Grace Company et al → Shop; 1980-06-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rapoca Energy Company → Shop; 1980-07-01 to 1985-09-26; source msha-controller-operator-history
- **controller_controls_operator:** W R Grace Company et al → Rapoca Energy Company; 1980-07-01 to 1985-09-26; source msha-controller-operator-history
- **controller_controls_operator:** M A Hanna Company et al → Rapoca Energy Company; 1980-07-01 to 1985-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Rapoca Energy Company → Shop; 1985-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Southern Mining Co → Shop; 1985-09-27 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Southern Mining Co → Rapoca Energy Company; 1985-09-27 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Shop; 2006-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Rapoca Energy Company; 2006-01-02 to current/open; source msha-controller-operator-history