# Relationship history for MSHA mine 2103517

Current hierarchy: **Gary L  Kelm; Trudy K  Kelm → Gary Kelm Dirt Service → Screener**

- 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

- **operator_operates_mine:** Gary Kelm Dirt Service → Screener; 2005-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Trudy K  Kelm et al → Screener; 2005-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trudy K  Kelm et al → Gary Kelm Dirt Service; 2005-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Kelm et al → Gary Kelm Dirt Service; 2005-11-08 to current/open; source msha-controller-operator-history