# Relationship history for MSHA mine 2501308

Current hierarchy: **Lance J Quall; Cale E Quall → QBQ Industries, LLC → Portable Plant #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** QBQ Industries, LLC → Portable Plant #1; 2019-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lance J Quall et al → Portable Plant #1; 2019-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lance J Quall et al → QBQ Industries, LLC; 2019-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cale E Quall et al → QBQ Industries, LLC; 2019-09-05 to current/open; source msha-controller-operator-history