# Relationship history for MSHA mine 1517754

Current hierarchy: **Edward  Hartsock → C & A Construction Inc → Big Springs Rd Job**

- 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:** C & A Construction Inc → Big Springs Rd Job; 1996-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edward  Hartsock → Big Springs Rd Job; 1996-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Hartsock → C & A Construction Inc; 1996-02-01 to current/open; source msha-controller-operator-history