# Relationship history for MSHA mine 4503426

Current hierarchy: **Ron  Christensen → We Dig It Gravel Inc → WE DIG IT GRAVEL INC**

- 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:** We Dig It Gravel Inc → WE DIG IT GRAVEL INC; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Christensen → WE DIG IT GRAVEL INC; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Christensen → We Dig It Gravel Inc; 2000-02-01 to current/open; source msha-controller-operator-history