# Relationship history for MSHA mine 4503701

Current hierarchy: **Granite Construction Inc → Granite Construction Company → Conway Pit**

- 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

- **controller_controls_mine:** Granite Construction Inc → Conway Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Granite Construction Company → Conway Pit; 2012-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Granite Construction Company; 2012-03-12 to current/open; source msha-controller-operator-history