# Relationship history for MSHA mine 0801371

Current hierarchy: **C R  Campbell Sr → Sand and Dirt, Inc. → CENTURY 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** C R  Campbell Sr et al → CENTURY PIT; 1990-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sand and Dirt, Inc. → CENTURY PIT; 2008-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C R  Campbell Sr et al → Sand and Dirt, Inc.; 2008-09-25 to current/open; source msha-controller-operator-history