# Relationship history for MSHA mine 0201054

Current hierarchy: **Calmat Company → Calmat Company Of Arizona → Tangerine Road Plant**

- 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:** Kroecker Contracting Company Inc → Tangerine Road Plant; 1950-01-01 to 1983-09-17; source msha-controller-operator-history
- **controller_controls_mine:** Kroecker Richard J → Tangerine Road Plant; 1950-01-01 to 1983-09-17; source msha-controller-operator-history
- **controller_controls_operator:** Kroecker Richard J → Kroecker Contracting Company Inc; 1950-01-01 to 1983-09-17; source msha-controller-operator-history
- **controller_controls_mine:** R E  Miller → Tangerine Road Plant; 1950-01-01 to 1988-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Calmat Company → Tangerine Road Plant; 1983-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R E Miller Paving & Construction Inc → Tangerine Road Plant; 1983-09-18 to 1988-03-31; source msha-controller-operator-history
- **controller_controls_operator:** R E  Miller → R E Miller Paving & Construction Inc; 1983-09-18 to 1988-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Calmat Company Of Arizona → Tangerine Road Plant; 1988-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Calmat Company Of Arizona; 1988-04-01 to current/open; source msha-controller-operator-history