# Relationship history for MSHA mine 1517112

Current hierarchy: **Hattie F  Johnson → Rocky Hollow Coal Company Inc → #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:** Hattie F  Johnson → #2; 1989-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Hollow Coal Company Inc → #2; 1991-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hattie F  Johnson → Rocky Hollow Coal Company Inc; 1991-08-01 to current/open; source msha-controller-operator-history