# Relationship history for MSHA mine 4300455

Current hierarchy: **Longmoore David N → Longmoore Sand & Gravel → LONGMOORE PIT**

- 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:** Longmoore Sand & Gravel → LONGMOORE PIT; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Longmoore David N → LONGMOORE PIT; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Longmoore David N → Longmoore Sand & Gravel; 1990-04-01 to current/open; source msha-controller-operator-history