# Relationship history for MSHA mine 2003254

Current hierarchy: **Albert  Swartz; Edward  Swartz → Jule Swartz & Sons Excavators → Mayo Pit**

- 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:** Jule Swartz & Sons Excavators → Mayo Pit; 2002-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albert  Swartz et al → Mayo Pit; 2002-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert  Swartz et al → Jule Swartz & Sons Excavators; 2002-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Swartz et al → Jule Swartz & Sons Excavators; 2002-09-03 to current/open; source msha-controller-operator-history