# Relationship history for MSHA mine 4503618

Current hierarchy: **John  Quigg; Neil  Quigg → Quigg Brothers Inc. → Humptulips 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** John  Quigg et al → Humptulips Gravel; 2001-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quigg Brothers Inc. → Humptulips Gravel; 2006-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Quigg et al → Quigg Brothers Inc.; 2006-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Neil  Quigg et al → Quigg Brothers Inc.; 2006-11-07 to current/open; source msha-controller-operator-history