# Relationship history for MSHA mine 3102134

Current hierarchy: **Martha  Hewett; James C  Hewett → James C. Hewetts Sand and Gravel → James C. Hewetts Sand and Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** James C. Hewetts Sand and Gravel → James C. Hewetts Sand and Gravel; 1999-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James C  Hewett et al → James C. Hewetts Sand and Gravel; 1999-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James C  Hewett et al → James C. Hewetts Sand and Gravel; 1999-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martha  Hewett et al → James C. Hewetts Sand and Gravel; 1999-02-01 to current/open; source msha-controller-operator-history