# Relationship history for MSHA mine 1103046

Current hierarchy: **Weast Construction Company Inc → Weast Construction Co., Inc. → Weast Sand & Gravel Co.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Weast Construction Co., Inc. → Weast Sand & Gravel Co.; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Weast Construction Company Inc → Weast Sand & Gravel Co.; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weast Construction Company Inc → Weast Construction Co., Inc.; 1999-06-01 to current/open; source msha-controller-operator-history