# Relationship history for MSHA mine 3900914

Current hierarchy: **James L  Dean → Dakota Stone Mining & Stone Supply Inc. → Dakota Stone Mining & Stone Supply Inc**

- 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:** Jimmy C Dean → Dakota Stone Mining & Stone Supply Inc; 1950-01-01 to 1988-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Jimmy C  Dean → Dakota Stone Mining & Stone Supply Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy C  Dean → Jimmy C Dean; 1950-01-01 to 1988-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Dakota Stone Mining & Stone Supply Inc. → Dakota Stone Mining & Stone Supply Inc; 1988-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James L  Dean → Dakota Stone Mining & Stone Supply Inc; 1988-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L  Dean → Dakota Stone Mining & Stone Supply Inc.; 1988-04-07 to current/open; source msha-controller-operator-history