# Relationship history for MSHA mine 3607900

Current hierarchy: **Alfred J  Brown → S B M Coal → Peach Mt Mine**

- 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:** Alfred J  Brown → Peach Mt Mine; 1985-07-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S B M Coal → Peach Mt Mine; 1987-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alfred J  Brown → S B M Coal; 1987-07-01 to current/open; source msha-controller-operator-history