# Relationship history for MSHA mine 1901294

Current hierarchy: **John  Beckman III → JOHN'S HARDW & POOL SUP → PORTABLE EQUIPMENT**

- 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:** John's Hardw & Pool Sup → PORTABLE EQUIPMENT; 2021-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Beckman III → PORTABLE EQUIPMENT; 2021-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Beckman III → John's Hardw & Pool Sup; 2021-06-22 to current/open; source msha-controller-operator-history