# Relationship history for MSHA mine 1510909

Current hierarchy: **Music Dexter → Judex Coal Company Inc → Mine No 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

- **controller_controls_mine:** Johnson Elwood Et Al → Mine No 1; 1976-11-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hall Coal Company Inc → Mine No 1; 1977-09-01 to 1978-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Hall Dewey → Mine No 1; 1977-09-01 to 1978-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Hall Dewey → Hall Coal Company Inc; 1977-09-01 to 1978-01-31; source msha-controller-operator-history
- **operator_operates_mine:** T & J Coal Company Inc → Mine No 1; 1978-02-01 to 1984-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Elwood Et Al → T & J Coal Company Inc; 1978-02-01 to 1984-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Judex Coal Company Inc → Mine No 1; 1984-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Music Dexter → Mine No 1; 1984-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Music Dexter → Judex Coal Company Inc; 1984-07-16 to current/open; source msha-controller-operator-history