# Relationship history for MSHA mine 1516722

Current hierarchy: **James A  Hubbard → Nu Enterprise Corp → Mine No 2**

- 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

- **controller_controls_mine:** Darrell L  Boyd → Mine No 2; 1984-02-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wampler Brothers Coal Company Inc → Mine No 2; 1989-09-01 to 1992-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Darrell L  Boyd → Wampler Brothers Coal Company Inc; 1989-09-01 to 1992-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Salyers Roger & Jerry Farley → Mine No 2; 1992-04-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & D Energy Inc → Mine No 2; 1992-07-21 to 2001-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Salyers Roger & Jerry Farley → B & D Energy Inc; 1992-07-21 to 2001-07-25; source msha-controller-operator-history
- **controller_controls_mine:** James A  Hubbard → Mine No 2; 2001-01-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nu Enterprise Corp → Mine No 2; 2001-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Hubbard → Nu Enterprise Corp; 2001-07-26 to current/open; source msha-controller-operator-history