# Relationship history for MSHA mine 3604033

Current hierarchy: **Nate  Wilkinson; Garrett  Wilkinson; Ryan  Wilkinson → Wilkinson Aggregates, Inc. → WAI Plant #2**

- 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

- **operator_operates_mine:** Union City Sand & Gravel Inc → WAI Plant #2; 1950-01-01 to 1995-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Norbert  Cross → WAI Plant #2; 1950-01-01 to 1995-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Norbert  Cross → Union City Sand & Gravel Inc; 1950-01-01 to 1995-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Troyer Sand & Gravel Ltd → WAI Plant #2; 1995-06-15 to 2020-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Ronald G  Troyer → WAI Plant #2; 1995-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald G  Troyer → Troyer Sand & Gravel Ltd; 1995-06-15 to 2020-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Nate  Wilkinson et al → WAI Plant #2; 2019-05-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wilkinson Aggregates, Inc. → WAI Plant #2; 2020-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nate  Wilkinson et al → Wilkinson Aggregates, Inc.; 2020-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan  Wilkinson et al → Wilkinson Aggregates, Inc.; 2020-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garrett  Wilkinson et al → Wilkinson Aggregates, Inc.; 2020-04-17 to current/open; source msha-controller-operator-history