# Relationship history for MSHA mine 4202728

Current hierarchy: **Gary  Burningham; Jeff  Burningham → Burningham Enterprises Inc → Portable #2**

- 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:** Gary  Burningham et al → Portable #2; 2009-10-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Burningham Enterprises Inc → Portable #2; 2021-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Burningham et al → Burningham Enterprises Inc; 2021-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Burningham et al → Burningham Enterprises Inc; 2021-07-29 to current/open; source msha-controller-operator-history