# Relationship history for MSHA mine 2000768

Current hierarchy: **Irv  Rupersburg; Mark K Johnston → Koenig Materials, LLC → Koenig Materials, LLC**

- 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:** Koenig Sand & Gravel, LLC → Koenig Materials, LLC; 1950-01-01 to 2022-01-23; source msha-controller-operator-history
- **controller_controls_mine:** Peter G  Fredericks et al → Koenig Materials, LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter G  Fredericks et al → Koenig Sand & Gravel, LLC; 1950-01-01 to 2022-01-23; source msha-controller-operator-history
- **controller_controls_operator:** Norman J  Fredericks Jr et al → Koenig Sand & Gravel, LLC; 1950-01-01 to 2022-01-23; source msha-controller-operator-history
- **operator_operates_mine:** Koenig Materials, LLC → Koenig Materials, LLC; 2022-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark K Johnston et al → Koenig Materials, LLC; 2022-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark K Johnston et al → Koenig Materials, LLC; 2022-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Irv  Rupersburg et al → Koenig Materials, LLC; 2022-01-24 to current/open; source msha-controller-operator-history