# Relationship history for MSHA mine 2003324

Current hierarchy: **Mark L  Manthei; James  Manthei → MDC Contracting LLC → CEC SCREEN-IT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** James  Manthei et al → CEC SCREEN-IT; 2003-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** MDC Contracting LLC → CEC SCREEN-IT; 2005-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Manthei et al → MDC Contracting LLC; 2005-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark L  Manthei et al → MDC Contracting LLC; 2005-06-20 to current/open; source msha-controller-operator-history