# Relationship history for MSHA mine 4405886

Current hierarchy: **Coleman Dennis S → S & D Coal Company Inc → No 1**

- 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:** Coleman Dennis S → No 1; 1976-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & D Coal Company Inc → No 1; 1982-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Dennis S → S & D Coal Company Inc; 1982-05-01 to current/open; source msha-controller-operator-history