# Relationship history for MSHA mine 1900552

Current hierarchy: **J F Price Company → J F Price Company → J F Price Company Sand And Gravel Mine A**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** J F Price Company → J F Price Company Sand And Gravel Mine A; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J F Price Company → J F Price Company Sand And Gravel Mine A; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J F Price Company → J F Price Company; 1950-01-01 to current/open; source msha-controller-operator-history