# Relationship history for MSHA mine 4608012

Current hierarchy: **Graham Timothy E → Scioto Coal & Coke → No 1 Dredge**

- 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:** Graham Timothy E Et Al → No 1 Dredge; 1990-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Scioto Coal & Coke → No 1 Dredge; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graham Timothy E Et Al → Scioto Coal & Coke; 1991-03-01 to current/open; source msha-controller-operator-history