# Relationship history for MSHA mine 0801434

Current hierarchy: **Nick T  Stewart → Stewart Materials, LLC → Boar Hammock Sand Mine**

- 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:** Nick T  Stewart → Boar Hammock Sand Mine; 1991-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stewart Materials, LLC → Boar Hammock Sand Mine; 2021-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick T  Stewart → Stewart Materials, LLC; 2021-04-16 to current/open; source msha-controller-operator-history