# Relationship history for MSHA mine 1201425

Current hierarchy: **Rees Edward J → B B Bryan Company → Sandyhook Strip**

- 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:** B B Bryan Company → Sandyhook Strip; 1975-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rees Edward J → Sandyhook Strip; 1975-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rees Edward J → B B Bryan Company; 1975-10-01 to current/open; source msha-controller-operator-history