# Relationship history for MSHA mine 4406252

Current hierarchy: **Gary  Baker → Ivy Branch Coal Company Inc → No 16**

- 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:** Deel Nubern-William Et Al → No 16; 1980-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ivy Branch Coal Company Inc → No 16; 1985-09-01 to 1990-05-24; source msha-controller-operator-history
- **controller_controls_operator:** Deel Nubern-William Et Al → Ivy Branch Coal Company Inc; 1985-09-01 to 1990-05-24; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Baker → No 16; 1990-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ivy Branch Coal Company Inc → No 16; 1990-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Baker → Ivy Branch Coal Company Inc; 1990-05-25 to current/open; source msha-controller-operator-history