# Relationship history for MSHA mine 2602346

Current hierarchy: **Grant B  Smith → Grant Smith Aggregates Inc → Yerington 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Bedrock Products Inc → Yerington Plant; 1998-02-01 to 1999-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Mary Ann  Infantino → Yerington Plant; 1998-02-01 to 1999-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Mary Ann  Infantino → Bedrock Products Inc; 1998-02-01 to 1999-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Grant Smith Aggregates Inc → Yerington Plant; 1999-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grant B  Smith → Yerington Plant; 1999-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grant B  Smith → Grant Smith Aggregates Inc; 1999-07-15 to current/open; source msha-controller-operator-history