# Relationship history for MSHA mine 0300278

Current hierarchy: **Powers Earl H → Koal Industries International Inc → Mine #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:** Farrell Mining Co → Mine #1; 1950-01-01 to 1974-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Farrell Mining Co → Mine #1; 1950-01-01 to 1974-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Farrell Mining Co → Farrell Mining Co; 1950-01-01 to 1974-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Sugarloaf Mining Company → Mine #1; 1974-07-01 to 1982-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Nippon Kokan K K et al → Mine #1; 1974-07-01 to 1998-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Nippon Kokan K K et al → Sugarloaf Mining Company; 1974-07-01 to 1982-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Southern States Corp → Mine #1; 1982-09-24 to 1985-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Southern States Corp → Mine #1; 1982-09-24 to 1985-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Southern States Corp → Southern States Corp; 1982-09-24 to 1985-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Black Crystal Energy Inc → Mine #1; 1985-10-01 to 1987-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Will Larry → Mine #1; 1985-10-01 to 1987-04-12; source msha-controller-operator-history
- **controller_controls_operator:** Will Larry → Black Crystal Energy Inc; 1985-10-01 to 1987-04-12; source msha-controller-operator-history
- **operator_operates_mine:** Koal Industries International Inc → Mine #1; 1987-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Powers Earl H → Mine #1; 1987-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Powers Earl H → Koal Industries International Inc; 1987-04-13 to current/open; source msha-controller-operator-history