# Relationship history for MSHA mine 4607104

Current hierarchy: **Brown Larry A → Bell Creek Coal Company → Mine 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

- **operator_operates_mine:** Bell Creek Coal Company → Mine No 1; 1986-04-01 to 1990-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Bernard → Mine No 1; 1986-04-01 to 1990-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Bernard → Bell Creek Coal Company; 1986-04-01 to 1990-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Bell Creek Coal Company → Mine No 1; 1990-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brown Larry A → Mine No 1; 1990-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Larry A → Bell Creek Coal Company; 1990-06-04 to current/open; source msha-controller-operator-history