# Relationship history for MSHA mine 1516123

Current hierarchy: **Bailey Toby & Teddy → Four-B 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:** Shelby L  Wilson et al → No 1; 1984-09-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lee W Coal Company Inc → No 1; 1987-07-01 to 1991-05-16; source msha-controller-operator-history
- **controller_controls_operator:** Shelby L  Wilson et al → Lee W Coal Company Inc; 1987-07-01 to 1991-05-16; source msha-controller-operator-history
- **operator_operates_mine:** Four-B Inc → No 1; 1991-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bailey Toby & Teddy Et Al → No 1; 1991-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Toby & Teddy Et Al → Four-B Inc; 1991-05-17 to current/open; source msha-controller-operator-history