# Relationship history for MSHA mine 1515980

Current hierarchy: **Hayes Steve & Scott Miller → S & D Coal → #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:** Jarboe James D → #2; 1985-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tenn Ky Blue Gem Inc → #2; 1987-01-01 to 1988-02-08; source msha-controller-operator-history
- **controller_controls_operator:** Jarboe James D → Tenn Ky Blue Gem Inc; 1987-01-01 to 1988-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Hayes Steve & Scott Miller → #2; 1988-01-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & J Coal → #2; 1988-02-09 to 1989-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Hayes Dennis → #2; 1988-02-09 to 1989-05-28; source msha-controller-operator-history
- **controller_controls_operator:** Hayes Dennis → D & J Coal; 1988-02-09 to 1989-05-28; source msha-controller-operator-history
- **operator_operates_mine:** J & J Coal Company → #2; 1989-05-29 to 1989-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Morris Jim → #2; 1989-05-29 to 1990-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Morris Jim → J & J Coal Company; 1989-05-29 to 1989-07-13; source msha-controller-operator-history
- **operator_operates_mine:** S & D Coal → #2; 1989-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hayes Steve & Scott Miller → S & D Coal; 1989-07-14 to current/open; source msha-controller-operator-history