# Relationship history for MSHA mine 0102532

Current hierarchy: **Rock John D Jr → Hard Rock Mining → Hard Rock #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Hard Rock Mining → Hard Rock #1; 1983-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rock John D Jr → Hard Rock #1; 1983-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rock John D Jr → Hard Rock Mining; 1983-02-01 to current/open; source msha-controller-operator-history