# Relationship history for MSHA mine 4105114

Current hierarchy: **Ted  Sawyer; Mark  Douglas → Rolling Plains Material LTD → Briscoe County Aggregate Pit**

- 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:** Rolling Plains Material LTD → Briscoe County Aggregate Pit; 2015-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Sawyer et al → Briscoe County Aggregate Pit; 2015-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Sawyer et al → Rolling Plains Material LTD; 2015-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Douglas et al → Rolling Plains Material LTD; 2015-03-09 to current/open; source msha-controller-operator-history