# Relationship history for MSHA mine 1517093

Current hierarchy: **Webb Darrel → W & W Coal Corp → Mine #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:** Hunsaker Ted Jr → Mine #1; 1990-06-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & H Mining Inc → Mine #1; 1991-07-01 to 1992-01-20; source msha-controller-operator-history
- **controller_controls_operator:** Hunsaker Ted Jr → H & H Mining Inc; 1991-07-01 to 1992-01-20; source msha-controller-operator-history
- **controller_controls_mine:** Webb Darrel → Mine #1; 1991-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W & W Coal Corp → Mine #1; 1992-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Webb Darrel → W & W Coal Corp; 1992-01-21 to current/open; source msha-controller-operator-history