# Relationship history for MSHA mine 4103191

Current hierarchy: **Wayne  Yates → Yates & Sons Construction Materials → Downing Bro Blum Pit**

- 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:** Yates & Sons Construction Materials → Downing Bro Blum Pit; 1983-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wayne  Yates → Downing Bro Blum Pit; 1983-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Yates → Yates & Sons Construction Materials; 1983-08-01 to current/open; source msha-controller-operator-history