# Relationship history for MSHA mine 2402044

Current hierarchy: **Kyle N Berg → QUARTZ CONSTRUCTION, LLC → PORTABLE NUMBER ONE**

- 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:** Steve  Koontz → PORTABLE NUMBER ONE; 1990-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Koontz Construction Inc → PORTABLE NUMBER ONE; 1994-04-01 to 2020-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Koontz → Koontz Construction Inc; 1994-04-01 to 2020-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Quartz Construction, LLC → PORTABLE NUMBER ONE; 2020-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kyle N Berg → PORTABLE NUMBER ONE; 2020-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kyle N Berg → Quartz Construction, LLC; 2020-10-13 to current/open; source msha-controller-operator-history