# Relationship history for MSHA mine 4200024

Current hierarchy: **Lhoist Group → Chemical Lime Company Of Arizona → Delle 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:** Utah Marblehead Lime Company → Delle Plant; 1950-01-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_mine:** General Dynamics Corp → Delle Plant; 1950-01-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_operator:** General Dynamics Corp → Utah Marblehead Lime Company; 1950-01-01 to 1988-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Chemical Lime Company → Delle Plant; 1986-12-04 to 1998-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Material Energy Research & Recovery Corp → Delle Plant; 1988-03-23 to 1993-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Union Pacific Corp → Delle Plant; 1988-03-23 to 1993-06-27; source msha-controller-operator-history
- **controller_controls_operator:** Union Pacific Corp → Material Energy Research & Recovery Corp; 1988-03-23 to 1993-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Chemical Lime Company Of Arizona → Delle Plant; 1993-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chemical Lime Company → Chemical Lime Company Of Arizona; 1993-06-28 to 1998-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Lhoist Group → Delle Plant; 1998-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lhoist Group → Chemical Lime Company Of Arizona; 1998-12-31 to current/open; source msha-controller-operator-history