# Relationship history for MSHA mine 2002995

Current hierarchy: **CRH PLC → Michigan Paving and Materials Company → Patterson Road**

- 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:** Donald J  Fennema → Patterson Road; 1981-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** South Kent Gravel Inc → Patterson Road; 1997-03-01 to 1999-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Donald J  Fennema → South Kent Gravel Inc; 1997-03-01 to 1999-08-19; source msha-controller-operator-history
- **operator_operates_mine:** South Kent Sand & Gravel Inc. → Patterson Road; 1999-08-20 to 2007-06-12; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Patterson Road; 1999-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → South Kent Sand & Gravel Inc.; 1999-08-20 to 2007-06-12; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Patterson Road; 2005-08-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Michigan Paving and Materials Company → Patterson Road; 2007-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Michigan Paving and Materials Company; 2007-06-13 to current/open; source msha-controller-operator-history