# Relationship history for MSHA mine 0404031

Current hierarchy: **Linda S  Brunius; Eric T  Brunius → Sierra Rock  LLC → Diamond 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 Rock → Diamond Quarry; 1978-03-01 to 2016-02-03; source msha-controller-operator-history
- **controller_controls_mine:** Loring H  Brunius → Diamond Quarry; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Loring H  Brunius → Sierra Rock; 1978-03-01 to 2016-02-03; source msha-controller-operator-history
- **operator_operates_mine:** Sierra Rock  LLC → Diamond Quarry; 2016-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Linda S  Brunius et al → Diamond Quarry; 2016-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linda S  Brunius et al → Sierra Rock  LLC; 2016-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric T  Brunius et al → Sierra Rock  LLC; 2016-02-04 to current/open; source msha-controller-operator-history