# Relationship history for MSHA mine 4104569

Current hierarchy: **John C  Mullen; John J  Norby → metro south materials → crusher #1**

- 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

- **operator_operates_mine:** metro south materials → crusher #1; 2006-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John J  Norby et al → crusher #1; 2006-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John J  Norby et al → metro south materials; 2006-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John C  Mullen et al → metro south materials; 2006-01-23 to current/open; source msha-controller-operator-history