# Relationship history for MSHA mine 2402751

Current hierarchy: **Mark  Sandry → Sandry Construction Co., Inc. → Sandry 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Sandry Construction Co., Inc. → Sandry Pit; 2020-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Sandry → Sandry Pit; 2020-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Sandry → Sandry Construction Co., Inc.; 2020-01-31 to current/open; source msha-controller-operator-history