# Relationship history for MSHA mine 4703934

Current hierarchy: **David  Kartechner; Nick  Kartechner → Kartechner Brothers LLC → Hazemag Impactor**

- 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:** David  Kartechner et al → Hazemag Impactor; 2022-05-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kartechner Brothers LLC → Hazemag Impactor; 2023-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Kartechner et al → Kartechner Brothers LLC; 2023-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick  Kartechner et al → Kartechner Brothers LLC; 2023-03-10 to current/open; source msha-controller-operator-history