# Relationship history for MSHA mine 1601620

Current hierarchy: **Gail Marie  Nolan; James  Nolan → TRI PARISH SAND & GRAVEL → PIT 63**

- 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:** James  Nolan et al → PIT 63; 2020-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** TRI PARISH SAND & GRAVEL → PIT 63; 2025-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Nolan et al → TRI PARISH SAND & GRAVEL; 2025-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gail Marie  Nolan et al → TRI PARISH SAND & GRAVEL; 2025-04-22 to current/open; source msha-controller-operator-history