# Relationship history for MSHA mine 2601058

Current hierarchy: **Apperson J A → Day & Zimmerman/Basil Corp → Navy Beach Gravel 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

- **operator_operates_mine:** Day & Zimmerman/Basil Corp → Navy Beach Gravel Pit; 1983-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Apperson J A → Navy Beach Gravel Pit; 1983-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Apperson J A → Day & Zimmerman/Basil Corp; 1983-05-01 to current/open; source msha-controller-operator-history