# Relationship history for MSHA mine 1518745

Current hierarchy: **Ray E  Collett; Richard  L  Collett → DATAEM Industries → A-24**

- 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

- **controller_controls_mine:** Ray E  Collett  et al → A-24; 2000-04-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** DATAEM Industries → A-24; 2004-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray E  Collett  et al → DATAEM Industries; 2004-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  L  Collett  et al → DATAEM Industries; 2004-04-20 to current/open; source msha-controller-operator-history