# Relationship history for MSHA mine 2402781

Current hierarchy: **CRH PLC → Helena Sand & Gravel, Inc. → Griffen Site**

- 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:** Joseph L  Horner Jr → Griffen Site; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Griffen Site; 2002-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** MRTE, Inc → Griffen Site; 2022-08-23 to 2025-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Joseph L  Horner Jr → MRTE, Inc; 2022-08-23 to 2025-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Helena Sand & Gravel, Inc. → Griffen Site; 2025-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Helena Sand & Gravel, Inc.; 2025-04-26 to current/open; source msha-controller-operator-history