# Relationship history for MSHA mine 1001398

Current hierarchy: **Shannon L  Williams → Midvale Sand & Gravel → Midvale 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Midvale Sand & Gravel → Midvale Sand & Gravel; 1979-01-01 to 2011-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Paul D  Williams → Midvale Sand & Gravel; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul D  Williams → Midvale Sand & Gravel; 1979-01-01 to 2011-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Midvale Sand & Gravel → Midvale Sand & Gravel; 2011-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shannon L  Williams → Midvale Sand & Gravel; 2011-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shannon L  Williams → Midvale Sand & Gravel; 2011-07-12 to current/open; source msha-controller-operator-history