# Relationship history for MSHA mine 0102009

Current hierarchy: **Dearman Jo T → Dearman Mining & Dredging → Dearman Mining And Dredging**

- 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:** Bulk Sand & Gravel Inc → Dearman Mining And Dredging; 1979-01-01 to 1980-09-08; source msha-controller-operator-history
- **controller_controls_mine:** Wood Kenneth → Dearman Mining And Dredging; 1979-01-01 to 1980-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Wood Kenneth → Bulk Sand & Gravel Inc; 1979-01-01 to 1980-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Dearman Mining & Dredging → Dearman Mining And Dredging; 1980-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dearman Jo T → Dearman Mining And Dredging; 1980-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dearman Jo T → Dearman Mining & Dredging; 1980-09-09 to current/open; source msha-controller-operator-history