# Relationship history for MSHA mine 3304425

Current hierarchy: **CRH PLC → WS&G dba London Aggregates → London Aggregates**

- 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

- **operator_operates_mine:** Heer Excavating Inc → London Aggregates; 1998-06-01 to 2001-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Daniel E  Heer → London Aggregates; 1998-06-01 to 2001-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Daniel E  Heer → Heer Excavating Inc; 1998-06-01 to 2001-02-13; source msha-controller-operator-history
- **operator_operates_mine:** London Aggregates → London Aggregates; 2001-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson S E Companies Inc → London Aggregates; 2001-02-14 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Johnson S E Companies Inc → London Aggregates; 2001-02-14 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → London Aggregates; 2003-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → London Aggregates; 2003-06-16 to current/open; source msha-controller-operator-history