# Relationship history for MSHA mine 2002812

Current hierarchy: **CRH PLC → Michigan Material and Aggregates → Stoneco Zeeb West**

- 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:** Rick  Massuch → Stoneco Zeeb West; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Waterland Trucking Service Inc → Stoneco Zeeb West; 1988-08-01 to 2013-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Massuch → Waterland Trucking Service Inc; 1988-08-01 to 2013-05-09; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Stoneco Zeeb West; 2005-08-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Michigan Material and Aggregates → Stoneco Zeeb West; 2013-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Michigan Material and Aggregates; 2013-05-10 to current/open; source msha-controller-operator-history