# Relationship history for MSHA mine 2302598

Current hierarchy: **Lance J Quall; Cale E Quall → QBQ Industries LLC → QBQ Portable 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Cale E Quall et al → QBQ Portable 2; 2019-09-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** QBQ Industries LLC → QBQ Portable 2; 2025-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cale E Quall et al → QBQ Industries LLC; 2025-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lance J Quall et al → QBQ Industries LLC; 2025-06-18 to current/open; source msha-controller-operator-history