# Relationship history for MSHA mine 0201073

Current hierarchy: **Calmat Company → Calmat Company Of Arizona → Avondale Plant #69 Or Plant #69**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Western Sand & Rock → Avondale Plant #69 Or Plant #69; 1950-01-01 to 1988-12-19; source msha-controller-operator-history
- **controller_controls_mine:** Quackenbush H E & Mike → Avondale Plant #69 Or Plant #69; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quackenbush H E & Mike → Western Sand & Rock; 1950-01-01 to 1988-12-19; source msha-controller-operator-history
- **controller_controls_mine:** Calmat Company → Avondale Plant #69 Or Plant #69; 1983-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Calmat Company Of Arizona → Avondale Plant #69 Or Plant #69; 1988-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Calmat Company Of Arizona; 1988-12-20 to current/open; source msha-controller-operator-history