# Relationship history for MSHA mine 1601593

Current hierarchy: **Gail Marie  Nolan; James  Nolan → Tri Parish Sand & Gravel, LLC → Tranquility Sand & Gravel**

- 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:** Tri Parish Sand & Gravel, LLC → Tranquility Sand & Gravel; 2020-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gail Marie  Nolan et al → Tranquility Sand & Gravel; 2020-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gail Marie  Nolan et al → Tri Parish Sand & Gravel, LLC; 2020-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Nolan et al → Tri Parish Sand & Gravel, LLC; 2020-06-01 to current/open; source msha-controller-operator-history