# Relationship history for MSHA mine 1001872

Current hierarchy: **Thomas  Chandler → Table Rock Sandstone, LLC → Table Rock Sandstone**

- 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:** Gerhard Borbonus Landscaping Inc → Table Rock Sandstone; 1991-08-01 to 2022-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Hans  Borbonus → Table Rock Sandstone; 1991-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hans  Borbonus → Gerhard Borbonus Landscaping Inc; 1991-08-01 to 2022-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Table Rock Sandstone, LLC → Table Rock Sandstone; 2022-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Chandler → Table Rock Sandstone; 2022-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Chandler → Table Rock Sandstone, LLC; 2022-07-11 to current/open; source msha-controller-operator-history