# Relationship history for MSHA mine 3901646

Current hierarchy: **Kory  Standy → Standy Rock & Gravel → Standy 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:** Standy Rock & Gravel → Standy Pit; 2020-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kory  Standy → Standy Pit; 2020-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kory  Standy → Standy Rock & Gravel; 2020-04-07 to current/open; source msha-controller-operator-history