# Relationship history for MSHA mine 3304817

Current hierarchy: **Jeffrey R  Sidwell → Sidwell Materials Inc → Rock Crusher #3**

- 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:** Jeffrey R  Sidwell → Rock Crusher #3; 1996-02-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sidwell Materials Inc → Rock Crusher #3; 2025-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey R  Sidwell → Sidwell Materials Inc; 2025-07-17 to current/open; source msha-controller-operator-history