# Relationship history for MSHA mine 3607655

Current hierarchy: **Barry David B & Roy W Hoffman → B & H Coal Company → No 7 Foot Slope**

- 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:** B & H Coal Company → No 7 Foot Slope; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barry David B & Roy W Hoffman → No 7 Foot Slope; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barry David B & Roy W Hoffman → B & H Coal Company; 1985-02-01 to current/open; source msha-controller-operator-history