# Relationship history for MSHA mine 0600615

Current hierarchy: **Marguerite M  Segalla → SEGALLA SAND & GRAVEL, INC. → SEGALLA SAND & GRAVEL, INC**

- 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:** SEGALLA SAND & GRAVEL, INC. → SEGALLA SAND & GRAVEL, INC; 1988-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marguerite M  Segalla et al → SEGALLA SAND & GRAVEL, INC; 1988-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marguerite M  Segalla et al → SEGALLA SAND & GRAVEL, INC.; 1988-08-01 to current/open; source msha-controller-operator-history