# Relationship history for MSHA mine 4503508

Current hierarchy: **Larry P  Scrivanich → Scrivanich → Iron Mountain Quarry**

- 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

- **controller_controls_mine:** Glen T.  Vergeront et al → Iron Mountain Quarry; 1997-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Cates → Iron Mountain Quarry; 2001-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Rock Products Inc → Iron Mountain Quarry; 2002-04-02 to 2003-01-16; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Cates → Interstate Rock Products Inc; 2002-04-02 to 2003-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Larry P  Scrivanich → Iron Mountain Quarry; 2002-04-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Montana Rock Products Inc → Iron Mountain Quarry; 2003-01-17 to 2020-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Glen T.  Vergeront et al → Montana Rock Products Inc; 2003-01-17 to 2020-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Charles R.  Vergeront et al → Montana Rock Products Inc; 2003-01-17 to 2020-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Scrivanich → Iron Mountain Quarry; 2020-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry P  Scrivanich → Scrivanich; 2020-06-10 to current/open; source msha-controller-operator-history