# Relationship history for MSHA mine 4601388

Current hierarchy: **Duba Melvin → Blue Hat Coals Inc → Mine No 15-A**

- 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:** Powellton Company → Mine No 15-A; 1950-01-01 to 1981-11-22; source msha-controller-operator-history
- **controller_controls_mine:** Siderius Inc → Mine No 15-A; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Siderius Inc → Powellton Company; 1950-01-01 to 1981-11-22; source msha-controller-operator-history
- **operator_operates_mine:** Jim & Jack Mining Corp → Mine No 15-A; 1981-11-23 to 1982-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Corns Jim → Mine No 15-A; 1981-11-23 to 1982-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Corns Jim → Jim & Jack Mining Corp; 1981-11-23 to 1982-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Jim & Jack Mining Corp → Mine No 15-A; 1982-08-17 to 1983-07-04; source msha-controller-operator-history
- **controller_controls_mine:** Hatfield Hubert-Drexel Milam & William Rolley → Mine No 15-A; 1982-08-17 to 1983-07-04; source msha-controller-operator-history
- **controller_controls_operator:** Hatfield Hubert-Drexel Milam & William Rolley → Jim & Jack Mining Corp; 1982-08-17 to 1983-07-04; source msha-controller-operator-history
- **operator_operates_mine:** Blue Hat Coals Inc → Mine No 15-A; 1983-07-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duba Melvin → Mine No 15-A; 1983-07-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duba Melvin → Blue Hat Coals Inc; 1983-07-05 to current/open; source msha-controller-operator-history