# Relationship history for MSHA mine 0405364

Current hierarchy: **Rick  Joy → R & J Joy, Inc. dba Joy Engineering → Blasted Rock Quarry**

- 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:** Sierra Aggregates → Blasted Rock Quarry; 1999-02-01 to 2009-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Diamond S Corp et al → Blasted Rock Quarry; 1999-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Diamond S Corp et al → Sierra Aggregates; 1999-02-01 to 2009-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Albert L  Folchi et al → Sierra Aggregates; 1999-02-01 to 2009-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Joy → Blasted Rock Quarry; 2001-10-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** The Blasted Rock Quarry → Blasted Rock Quarry; 2010-01-01 to 2014-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Elsie (Maylou)  Smith et al → Blasted Rock Quarry; 2010-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elsie (Maylou)  Smith et al → The Blasted Rock Quarry; 2010-01-01 to 2014-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy Wayne  Smith et al → The Blasted Rock Quarry; 2010-01-01 to 2014-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Joy Engineering → Blasted Rock Quarry; 2014-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Joy → Joy Engineering; 2014-11-17 to current/open; source msha-controller-operator-history