# Relationship history for MSHA mine 0301787

Current hierarchy: **Aaron A.  Brauer → Ozark Aggregates L.L.C. → Ozark Aggregates L.L.C.**

- 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:** Ozark Sand Company → Ozark Aggregates L.L.C.; 1997-05-01 to 2012-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Marcia  Hillard → Ozark Aggregates L.L.C.; 1997-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marcia  Hillard → Ozark Sand Company; 1997-05-01 to 2012-12-04; source msha-controller-operator-history
- **operator_operates_mine:** Ozark Aggregates L.L.C. → Ozark Aggregates L.L.C.; 2012-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taylor  Nietert et al → Ozark Aggregates L.L.C.; 2012-12-05 to 2013-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Taylor  Nietert et al → Ozark Aggregates L.L.C.; 2012-12-05 to 2013-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Aaron A  Brauer et al → Ozark Aggregates L.L.C.; 2012-12-05 to 2013-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Aaron A.  Brauer → Ozark Aggregates L.L.C.; 2013-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aaron A.  Brauer → Ozark Aggregates L.L.C.; 2013-04-01 to current/open; source msha-controller-operator-history