# Relationship history for MSHA mine 4002210

Current hierarchy: **Michael  Hollingshead → SRM Materials LLC. → Crab Orchard 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

- **operator_operates_mine:** Taylor Brothers Sand Co. Inc → Crab Orchard Quarry; 1950-01-01 to 2019-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Kelly V  Taylor → Crab Orchard Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly V  Taylor → Taylor Brothers Sand Co. Inc; 1950-01-01 to 2019-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Hollingshead et al → Crab Orchard Quarry; 2013-12-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SRM Materials LLC. → Crab Orchard Quarry; 2019-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Hollingshead et al → SRM Materials LLC.; 2019-03-06 to current/open; source msha-controller-operator-history