# Relationship history for MSHA mine 2103590

Current hierarchy: **Andrew  Heintz → Heintz Materials → Hack 1**

- 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:** KB Materials → Hack 1; 2007-06-07 to 2026-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Timothy J.  Kohner et al → Hack 1; 2007-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy J.  Kohner et al → KB Materials; 2007-06-07 to 2026-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Tony A  Kohner et al → KB Materials; 2007-06-07 to 2026-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Andrew  Heintz → Hack 1; 2025-05-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Heintz Materials → Hack 1; 2026-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew  Heintz → Heintz Materials; 2026-01-16 to current/open; source msha-controller-operator-history