# Relationship history for MSHA mine 4202336

Current hierarchy: **Newel K  Steed → Managed Construction → Kane County Ecological Study Site**

- 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:** Larry  Stubbs → Kane County Ecological Study Site; 2000-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Americo Rock & Sand → Kane County Ecological Study Site; 2002-03-07 to 2003-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Stubbs → Americo Rock & Sand; 2002-03-07 to 2003-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Managed Construction → Kane County Ecological Study Site; 2003-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Newel K  Steed → Kane County Ecological Study Site; 2003-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newel K  Steed → Managed Construction; 2003-03-12 to current/open; source msha-controller-operator-history