# Relationship history for MSHA mine 0103478

Current hierarchy: **C R  Campbell Sr → SOUTH ALABAMA MATERIALS, INC → SARDINE NORTH**

- 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

- **controller_controls_mine:** C R  Campbell Sr et al → SARDINE NORTH; 1990-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SOUTH ALABAMA MATERIALS, INC → SARDINE NORTH; 2014-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C R  Campbell Sr et al → SOUTH ALABAMA MATERIALS, INC; 2014-10-01 to current/open; source msha-controller-operator-history