# Relationship history for MSHA mine 1601346

Current hierarchy: **Glen D  Smith; Gary L  Smith Sr → Maintenance Dredging Inc → DREDGE GEORGIA""**

- 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:** Maintenance Dredging Inc → DREDGE GEORGIA""; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Glen D  Smith  et al → DREDGE GEORGIA""; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glen D  Smith  et al → Maintenance Dredging Inc; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Smith Sr  et al → Maintenance Dredging Inc; 1999-03-01 to current/open; source msha-controller-operator-history