# Relationship history for MSHA mine 2402605

Current hierarchy: **Bridget A Korpi; Adam R Korpi → Ironside Stone Works, Inc. → Madison Slate 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Rod A  Cranford → Madison Slate Quarry; 2006-12-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Madison Slate → Madison Slate Quarry; 2011-09-12 to 2013-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Marcus  Vacca → Madison Slate Quarry; 2011-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marcus  Vacca → Madison Slate; 2011-09-12 to 2013-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Rod Cranford Inc → Madison Slate Quarry; 2013-04-01 to 2021-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Rod A  Cranford → Rod Cranford Inc; 2013-04-01 to 2021-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Adam R Korpi et al → Madison Slate Quarry; 2018-03-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ironside Stone Works, Inc. → Madison Slate Quarry; 2021-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adam R Korpi et al → Ironside Stone Works, Inc.; 2021-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bridget A Korpi et al → Ironside Stone Works, Inc.; 2021-04-10 to current/open; source msha-controller-operator-history