# Relationship history for MSHA mine 0200704

Current hierarchy: **Lee  Jolley; Larry  Miller → B & R Materials → Sonora Environmental LLC dba B & R Mats**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Tanner Companies → Sonora Environmental LLC dba B & R Mats; 1950-01-01 to 1983-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Tanner Companies → Sonora Environmental LLC dba B & R Mats; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tanner Companies → Tanner Companies; 1950-01-01 to 1983-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Roland C  Browne → Sonora Environmental LLC dba B & R Mats; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & R Materials Corp → Sonora Environmental LLC dba B & R Mats; 1983-08-18 to 2004-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Roland C  Browne → B & R Materials Corp; 1983-08-18 to 2004-06-20; source msha-controller-operator-history
- **operator_operates_mine:** B & R Materials → Sonora Environmental LLC dba B & R Mats; 2004-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lee  Jolley  et al → Sonora Environmental LLC dba B & R Mats; 2004-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lee  Jolley  et al → B & R Materials; 2004-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Miller  et al → B & R Materials; 2004-06-21 to current/open; source msha-controller-operator-history