# Relationship history for MSHA mine 2401813

Current hierarchy: **Tom  Konitz → Konitz Contracting Inc → PORTABLE CRUSHER #2**

- 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

- **controller_controls_mine:** Tom  Konitz et al → PORTABLE CRUSHER #2; 1982-09-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Konitz Contracting Inc → PORTABLE CRUSHER #2; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Konitz et al → Konitz Contracting Inc; 1986-03-01 to current/open; source msha-controller-operator-history