# Relationship history for MSHA mine 0102173

Current hierarchy: **Smith Charles J & Charles R → Mineral Land & Mining Consultants Inc → Mine 3a**

- 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:** Smith Charles J & Charles R → Mine 3a; 1978-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mineral Land & Mining Consultants Inc → Mine 3a; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Charles J & Charles R → Mineral Land & Mining Consultants Inc; 1980-01-01 to current/open; source msha-controller-operator-history