# Relationship history for MSHA mine 4104351

Current hierarchy: **Benjamin  Davis → Nido Incorporated → Schertz Gravel Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Nido Incorporated → Schertz Gravel Plant; 2001-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin  Davis → Schertz Gravel Plant; 2001-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin  Davis → Nido Incorporated; 2001-09-10 to current/open; source msha-controller-operator-history