# Relationship history for MSHA mine 2103918

Current hierarchy: **Ivan D Pazdernik; Bill J Pazdernik → Paz Excavating Inc → Paz Mine**

- 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:** Paz Excavating Inc → Paz Mine; 2017-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill J Pazdernik et al → Paz Mine; 2017-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill J Pazdernik et al → Paz Excavating Inc; 2017-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ivan D Pazdernik et al → Paz Excavating Inc; 2017-08-22 to current/open; source msha-controller-operator-history