# Relationship history for MSHA mine 1517010

Current hierarchy: **Woods Frankie L → L D & D Coal Company → 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:** Jones James Et Al → No 1; 1987-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & J Coal → No 1; 1990-11-01 to 1992-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Jones James Et Al → J & J Coal; 1990-11-01 to 1992-06-08; source msha-controller-operator-history
- **operator_operates_mine:** L D & D Coal Company → No 1; 1992-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Woods Frankie L → No 1; 1992-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Woods Frankie L → L D & D Coal Company; 1992-06-09 to current/open; source msha-controller-operator-history