# Relationship history for MSHA mine 4003571

Current hierarchy: **F D  Justice II; Greg  Henzman → Contract Highwall Mining, LLC → CHM 23, Unit 4, & Unit 21**

- 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:** Greg  Henzman  et al → CHM 23, Unit 4, & Unit 21; 2004-03-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Contract Highwall Mining, LLC → CHM 23, Unit 4, & Unit 21; 2022-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Henzman  et al → Contract Highwall Mining, LLC; 2022-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** F D  Justice II  et al → Contract Highwall Mining, LLC; 2022-01-21 to current/open; source msha-controller-operator-history