# Relationship history for MSHA mine 3901288

Current hierarchy: **Jacob  Barkley → Dakota Stone, Inc → DAKOTA EAST 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Richard  Dilts et al → DAKOTA EAST QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dakota Granite Company → DAKOTA EAST QUARRY; 1982-09-01 to 2021-07-06; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Dilts et al → Dakota Granite Company; 1982-09-01 to 2021-07-06; source msha-controller-operator-history
- **operator_operates_mine:** Dakota Stone, Inc → DAKOTA EAST QUARRY; 2021-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jacob  Barkley → DAKOTA EAST QUARRY; 2021-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jacob  Barkley → Dakota Stone, Inc; 2021-07-07 to current/open; source msha-controller-operator-history