# Relationship history for MSHA mine 0402708

Current hierarchy: **Lyle  Tullis → Cottonwood Creek Sand & Gravel → Cottonwood Creek Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Tenney Construction Company Inc → Cottonwood Creek Sand & Gravel; 1950-01-01 to 1998-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Eugene A  Tenney → Cottonwood Creek Sand & Gravel; 1950-01-01 to 1998-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Eugene A  Tenney → Tenney Construction Company Inc; 1950-01-01 to 1998-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Cottonwood Creek Sand & Gravel → Cottonwood Creek Sand & Gravel; 1998-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lyle  Tullis → Cottonwood Creek Sand & Gravel; 1998-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lyle  Tullis → Cottonwood Creek Sand & Gravel; 1998-03-20 to current/open; source msha-controller-operator-history