# Relationship history for MSHA mine 4103694

Current hierarchy: **ATM Holdings LLC → Wright Materials → Portable Plant #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:** Ruth G  Wright et al → Portable Plant #1; 1950-01-01 to 2020-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Wright Materials Inc → Portable Plant #1; 1991-10-01 to 2024-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Ruth G  Wright et al → Wright Materials Inc; 1991-10-01 to 2020-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Tex-Mix Partners Ltd → Portable Plant #1; 2018-11-27 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Tracy  Wright et al → Portable Plant #1; 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 2024-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Wright et al → Wright Materials Inc; 2020-06-17 to 2024-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Mark W Truesdale et al → Wright Materials Inc; 2020-06-17 to 2024-06-02; source msha-controller-operator-history
- **controller_controls_mine:** ATM Holdings LLC → Portable Plant #1; 2022-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wright Materials → Portable Plant #1; 2024-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tex-Mix Partners Ltd → Wright Materials; 2024-06-03 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_operator:** ATM Holdings LLC → Wright Materials; 2024-06-03 to current/open; source msha-controller-operator-history