# Relationship history for MSHA mine 0201892

Current hierarchy: **Cemex S A → Chandler Ready Mix Inc → CHANDLER READY MIX-MINE #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:** Aztec Materials Inc → CHANDLER READY MIX-MINE #1; 1978-03-09 to 1995-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Perkins → CHANDLER READY MIX-MINE #1; 1978-03-09 to 1998-03-15; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Perkins → Aztec Materials Inc; 1978-03-09 to 1995-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Chandler Ready Mix Inc → CHANDLER READY MIX-MINE #1; 1995-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** RMC Group PLC → CHANDLER READY MIX-MINE #1; 1995-03-01 to 2005-08-30; source msha-controller-operator-history
- **controller_controls_operator:** RMC Group PLC → Chandler Ready Mix Inc; 1995-03-01 to 2005-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → CHANDLER READY MIX-MINE #1; 2005-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Chandler Ready Mix Inc; 2005-08-31 to current/open; source msha-controller-operator-history