# Relationship history for MSHA mine 1601199

Current hierarchy: **M D  Bryant Jr → Southern Filter Media Inc → SOUTHERN FILTER MEDIA INC**

- 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:** Southern Filter Media Inc → SOUTHERN FILTER MEDIA INC; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** M D  Bryant Jr et al → SOUTHERN FILTER MEDIA INC; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M D  Bryant Jr et al → Southern Filter Media Inc; 1990-03-01 to current/open; source msha-controller-operator-history