# Relationship history for MSHA mine 0102975

Current hierarchy: **Shaver Gene → Shaver Sand & Gravel Inc → Pit #3**

- 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

- **controller_controls_mine:** Shaver Gene → Pit #3; 1987-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shaver Sand & Gravel Inc → Pit #3; 1992-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shaver Gene → Shaver Sand & Gravel Inc; 1992-09-01 to current/open; source msha-controller-operator-history