# Relationship history for MSHA mine 4607074

Current hierarchy: **Nelson Thomas → Jim Dandy Coals Inc → No 4**

- 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

- **controller_controls_mine:** Riffle Johanna M → No 4; 1981-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jim Dandy Coals Inc → No 4; 1986-01-01 to 1993-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Riffle Johanna M → Jim Dandy Coals Inc; 1986-01-01 to 1993-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Jim Dandy Coals Inc → No 4; 1993-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nelson Thomas → No 4; 1993-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nelson Thomas → Jim Dandy Coals Inc; 1993-08-25 to current/open; source msha-controller-operator-history