# Relationship history for MSHA mine 1601278

Current hierarchy: **M D  Bryant Jr → Southern Filter Media, Inc. → GRAVEL 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** M D  Bryant Jr et al → GRAVEL PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** M D  Bryant Jr et al → GRAVEL PIT; 1990-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Silica Of La Inc → GRAVEL PIT; 1994-08-01 to 2004-01-12; source msha-controller-operator-history
- **controller_controls_operator:** M D  Bryant Jr et al → Southern Silica Of La Inc; 1994-08-01 to 2004-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Southern Filter Media, Inc. → GRAVEL PIT; 2004-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M D  Bryant Jr et al → Southern Filter Media, Inc.; 2004-01-13 to current/open; source msha-controller-operator-history