# Relationship history for MSHA mine 4503306

Current hierarchy: **John  Quigg; Neil  Quigg → Quigg Bros, Inc → Portable Crushing 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:** Port Blakely Tree Farms → Portable Crushing Plant #1; 1993-09-01 to 1995-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Port Blakely Co et al → Portable Crushing Plant #1; 1993-09-01 to 1995-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Port Blakely Co et al → Port Blakely Tree Farms; 1993-09-01 to 1995-11-19; source msha-controller-operator-history
- **operator_operates_mine:** Vessey & Sons → Portable Crushing Plant #1; 1995-11-20 to 2000-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Vessey Janice → Portable Crushing Plant #1; 1995-11-20 to 2000-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Vessey Janice → Vessey & Sons; 1995-11-20 to 2000-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Quigg Bros., Inc → Portable Crushing Plant #1; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Quigg et al → Portable Crushing Plant #1; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Quigg et al → Quigg Bros., Inc; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Neil  Quigg et al → Quigg Bros., Inc; 2001-01-01 to current/open; source msha-controller-operator-history