# Relationship history for MSHA mine 3003496

Current hierarchy: **Timothy Bryan  Girts → Girts Sand & Gravel LLC → Randy Wassink Pit**

- 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:** Girts Portable Crushing → Randy Wassink Pit; 2005-05-11 to 2012-02-29; source msha-controller-operator-history
- **controller_controls_mine:** David M  Girts Jr → Randy Wassink Pit; 2005-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  Girts Jr → Girts Portable Crushing; 2005-05-11 to 2012-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Girts Sand & Gravel LLC → Randy Wassink Pit; 2012-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy Bryan  Girts → Randy Wassink Pit; 2012-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy Bryan  Girts → Girts Sand & Gravel LLC; 2012-03-01 to current/open; source msha-controller-operator-history