# Relationship history for MSHA mine 1103177

Current hierarchy: **Wayne C  Stewart → WC Stewart Construction Inc. → Hilby 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Wayne C  Stewart → Hilby Quarry; 1992-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** WC Stewart Construction Inc. → Hilby Quarry; 2007-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne C  Stewart → WC Stewart Construction Inc.; 2007-08-24 to current/open; source msha-controller-operator-history