# Relationship history for MSHA mine 4801514

Current hierarchy: **Tim  Scherer; Ken  Scherer → Scherer Construction Llc → NORDBERG HP 300**

- 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:** Scherer Construction Llc → NORDBERG HP 300; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Scherer et al → NORDBERG HP 300; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Scherer et al → Scherer Construction Llc; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ken  Scherer et al → Scherer Construction Llc; 1993-06-01 to current/open; source msha-controller-operator-history