# Relationship history for MSHA mine 1518365

Current hierarchy: **Ray E  Collett; Richard  L  Collett → Dataem Industries Llc → Liggett #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

- **controller_controls_mine:** Richard  L  Collett  et al → Liggett #1; 2000-04-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dataem Industries Llc → Liggett #1; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  L  Collett  et al → Dataem Industries Llc; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray E  Collett  et al → Dataem Industries Llc; 2001-04-01 to current/open; source msha-controller-operator-history