# Relationship history for MSHA mine 2200622

Current hierarchy: **Henry C  Brevard Jr; David E  Brevard → Mississippi-Itawamba Gravel Company Inc → MATTOX 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

- **operator_operates_mine:** Mississippi-Itawamba Gravel Company Inc → MATTOX PIT; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David E  Brevard et al → MATTOX PIT; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David E  Brevard et al → Mississippi-Itawamba Gravel Company Inc; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry C  Brevard Jr et al → Mississippi-Itawamba Gravel Company Inc; 1990-06-01 to current/open; source msha-controller-operator-history