# Relationship history for MSHA mine 4801609

Current hierarchy: **Mike  Cook; Clinton  Cheeney → Cook-Harriet Construction → CHC Portable Crusher #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

- **operator_operates_mine:** Cook-Harriet Construction → CHC Portable Crusher #1; 2001-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mike  Cook  et al → CHC Portable Crusher #1; 2001-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Cook  et al → Cook-Harriet Construction; 2001-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clinton  Cheeney  et al → Cook-Harriet Construction; 2001-11-29 to current/open; source msha-controller-operator-history