# Relationship history for MSHA mine 4101521

Current hierarchy: **Larry  Wright; Tracy  Wright; Mark W Truesdale → Wright Materials Inc → Plant Number 3**

- 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:** Wright Materials Inc → Plant Number 3; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ruth G  Wright et al → Plant Number 3; 1950-01-01 to 2020-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Ruth G  Wright et al → Wright Materials Inc; 1950-01-01 to 2020-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Tracy  Wright et al → Plant Number 3; 2020-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tracy  Wright et al → Wright Materials Inc; 2020-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Wright et al → Wright Materials Inc; 2020-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark W Truesdale et al → Wright Materials Inc; 2020-06-17 to current/open; source msha-controller-operator-history