# Relationship history for MSHA mine 3402136

Current hierarchy: **Stone  Oren → Stone Oren → Stone Oren Quarry**

- 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:** Stone Oren → Stone Oren Quarry; 2013-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stone  Oren → Stone Oren Quarry; 2013-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stone  Oren → Stone Oren; 2013-05-21 to current/open; source msha-controller-operator-history