# Relationship history for MSHA mine 3201046

Current hierarchy: **Marv  Knopik → Knopik Pit Management → Masaba Screen Plant**

- 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:** Marv  Knopik et al → Masaba Screen Plant; 2011-03-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knopik Pit Management → Masaba Screen Plant; 2014-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marv  Knopik et al → Knopik Pit Management; 2014-12-09 to current/open; source msha-controller-operator-history