# Relationship history for MSHA mine 4202683

Current hierarchy: **Cristifer R Kohles → Integrity Materials Management → WT Portable**

- 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:** Wasatch Topsoil/Innovative Companies → WT Portable; 2018-01-29 to 2021-09-26; source msha-controller-operator-history
- **controller_controls_mine:** Darrin  Loerstcher → WT Portable; 2018-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrin  Loerstcher → Wasatch Topsoil/Innovative Companies; 2018-01-29 to 2021-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Integrity Materials Management → WT Portable; 2021-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cristifer R Kohles → WT Portable; 2021-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cristifer R Kohles → Integrity Materials Management; 2021-09-27 to current/open; source msha-controller-operator-history