# Relationship history for MSHA mine 1401333

Current hierarchy: **Mark  Ysidro → Aggregate Sand & Gravel Inc. → Aggregate Sand & Gravel Inc.**

- 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

- **operator_operates_mine:** Aggregate Sand & Gravel Inc → Aggregate Sand & Gravel Inc.; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth J  Cain → Aggregate Sand & Gravel Inc.; 1979-01-01 to 2016-01-20; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth J  Cain → Aggregate Sand & Gravel Inc; 1979-01-01 to 2016-01-20; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Ysidro → Aggregate Sand & Gravel Inc.; 2016-01-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Ysidro → Aggregate Sand & Gravel Inc; 2016-01-21 to current/open; source msha-controller-operator-history