# Relationship history for MSHA mine 4300558

Current hierarchy: **John  Byors → V.M.I.G. → SWANTON 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** V.M.I.G. → SWANTON QUARRY; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Byors → SWANTON QUARRY; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Byors → V.M.I.G.; 2001-05-01 to current/open; source msha-controller-operator-history