# Relationship history for MSHA mine 3304643

Current hierarchy: **CRH PLC → Shelly Materials Inc → Black 17**

- 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 → Black 17; 1996-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Black 17; 2000-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sidwell Materials Inc. → Black 17; 2010-03-01 to 2013-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey R  Sidwell → Sidwell Materials Inc.; 2010-03-01 to 2013-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Shelly Materials Inc → Black 17; 2013-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Shelly Materials Inc; 2013-01-15 to current/open; source msha-controller-operator-history