# Relationship history for MSHA mine 1518238

Current hierarchy: **Michael K  Cook; Randy A  Cook → Cook & Sons Mining Inc → Spring Branch 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:** Allen G  Stump et al → Spring Branch No 1; 1998-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gentec Processing Inc → Spring Branch No 1; 2000-02-01 to 2001-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Allen G  Stump et al → Gentec Processing Inc; 2000-02-01 to 2001-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Michael K  Cook et al → Spring Branch No 1; 2000-11-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cook & Sons Mining Inc → Spring Branch No 1; 2001-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael K  Cook et al → Cook & Sons Mining Inc; 2001-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy A  Cook et al → Cook & Sons Mining Inc; 2001-02-05 to current/open; source msha-controller-operator-history