# Relationship history for MSHA mine 1517807

Current hierarchy: **Hattie F  Johnson → Spud Mining 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; 1993-06-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky May Mining → #2; 1996-06-01 to 1996-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Spud Mining Inc → #2; 1996-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hattie F  Johnson → Spud Mining Inc; 1996-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Florida Progress Corporation → #2; 2000-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florida Progress Corporation → Kentucky May Mining; 2000-11-30 to 1996-07-22; source msha-controller-operator-history