# Relationship history for MSHA mine 4503458

Current hierarchy: **John  Quigg; Neil  Quigg → Quigg Bros Inc → Portable Plant #1**

- 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:** Olympic Crushing & Recycle Inc → Portable Plant #1; 2000-11-01 to 2002-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Waldner et al → Portable Plant #1; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Waldner et al → Olympic Crushing & Recycle Inc; 2000-11-01 to 2002-08-26; source msha-controller-operator-history
- **controller_controls_mine:** John  Quigg et al → Portable Plant #1; 2001-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quigg Bros Inc → Portable Plant #1; 2002-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Quigg et al → Quigg Bros Inc; 2002-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Neil  Quigg et al → Quigg Bros Inc; 2002-08-27 to current/open; source msha-controller-operator-history