# Relationship history for MSHA mine 1300733

Current hierarchy: **Elizabeth  Noble; David F Reusswig → Northern Filter Media, Inc → Northern Filter Media Plant & Dredge**

- 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:** Northern Filter Media, Inc → Northern Filter Media Plant & Dredge; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elizabeth  Noble et al → Northern Filter Media Plant & Dredge; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elizabeth  Noble et al → Northern Filter Media, Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David F Reusswig et al → Northern Filter Media, Inc; 1950-01-01 to current/open; source msha-controller-operator-history