# Relationship history for MSHA mine 0201476

Current hierarchy: **Calmat Company → Calmat Company Of Arizona → Mesa Plant #16**

- 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:** Arizona Sand & Rock Company → Mesa Plant #16; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_mine:** California Portland Cement Company → Mesa Plant #16; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_operator:** California Portland Cement Company → Arizona Sand & Rock Company; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Calmat Company → Mesa Plant #16; 1983-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Calmat Company Of Arizona → Mesa Plant #16; 1984-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Calmat Company Of Arizona; 1984-11-01 to current/open; source msha-controller-operator-history