# Relationship history for MSHA mine 4202550

Current hierarchy: **Jim  Jessop; Blaine  Gough → Gough Construction → Portable 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:** Gough Construction → Portable 1; 2010-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jim  Jessop et al → Portable 1; 2010-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim  Jessop et al → Gough Construction; 2010-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blaine  Gough et al → Gough Construction; 2010-04-20 to current/open; source msha-controller-operator-history