# Relationship history for MSHA mine 0600640

Current hierarchy: **Kelly Hilton J → H J Kelly Associates Inc → H. J. KELLY ASSC., INC.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** H J Kelly Associates Inc → H. J. KELLY ASSC., INC.; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kelly Hilton J → H. J. KELLY ASSC., INC.; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly Hilton J → H J Kelly Associates Inc; 1992-01-01 to current/open; source msha-controller-operator-history