# Relationship history for MSHA mine 3301661

Current hierarchy: **CRH PLC → Shelly Materials Inc → Shalersville North Plant**

- 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:** Standard Slag Company → Shalersville North Plant; 1950-01-01 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Standard Slag Company → Shalersville North Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Standard Slag Company → Standard Slag Company; 1950-01-01 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Shalersville North Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Corp → Shalersville North Plant; 1989-10-01 to 2001-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Corp; 1989-10-01 to 2001-08-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Shalersville North Plant; 2000-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Shalersville North Plant; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge North America Incorporated → Shalersville North Plant; 2001-09-01 to 2010-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge North America Incorporated; 2001-09-01 to 2010-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Shelly Materials Inc → Shalersville North Plant; 2010-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Shelly Materials Inc; 2010-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Shalersville North Plant; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge North America Incorporated; 2015-07-10 to 2010-04-19; source msha-controller-operator-history