# Relationship history for MSHA mine 0504722

Current hierarchy: **Lance L Johnson; Jim  Anttonen → Porta Crushers Inc → RENTED CRUSHER**

- 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:** Porta Crushers Inc → RENTED CRUSHER; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lance L Johnson et al → RENTED CRUSHER; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lance L Johnson et al → Porta Crushers Inc; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim  Anttonen et al → Porta Crushers Inc; 2001-08-01 to current/open; source msha-controller-operator-history