# Relationship history for MSHA mine 1901295

Current hierarchy: **William L  French Jr → W.L. French Excavating Corp → Portable Crusher - Rental Unit #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** William L  French Jr → Portable Crusher - Rental Unit #1; 2019-10-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W.L. French Excavating Corp → Portable Crusher - Rental Unit #1; 2021-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William L  French Jr → W.L. French Excavating Corp; 2021-10-05 to current/open; source msha-controller-operator-history