# Relationship history for MSHA mine 4200073

Current hierarchy: **Rhett  Roberts → Western Clay, a Redmond LLC → Western Clay, a Redmond LLC**

- 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

- **operator_operates_mine:** Western Clay Company → Western Clay, a Redmond LLC; 1950-01-01 to 2021-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Fred D  Mortensen et al → Western Clay, a Redmond LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred D  Mortensen et al → Western Clay Company; 1950-01-01 to 2021-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Western Clay, a Redmond LLC → Western Clay, a Redmond LLC; 2021-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rhett  Roberts → Western Clay, a Redmond LLC; 2021-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rhett  Roberts → Western Clay, a Redmond LLC; 2021-08-09 to current/open; source msha-controller-operator-history