# Relationship history for MSHA mine 1103037

Current hierarchy: **Leroy F Poignant Jr → Poignant Sand & Gravel Inc → POIGNANT 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Leroy F Poignant Jr → POIGNANT SAND & GRAVEL INC.; 1996-03-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Poignant Sand & Gravel Inc → POIGNANT SAND & GRAVEL INC.; 1999-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leroy F Poignant Jr → Poignant Sand & Gravel Inc; 1999-02-01 to current/open; source msha-controller-operator-history