# Relationship history for MSHA mine 3605438

Current hierarchy: **Vincent  Kassa → Silverbrook Anthracite Inc → Taylor B Strip**

- 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:** Vincent  Kassa → Taylor B Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Naples Michael Jr Et Al → Taylor B Strip; 1974-12-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L V D F Associates → Taylor B Strip; 1975-01-03 to 1977-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Naples Michael Jr Et Al → L V D F Associates; 1975-01-03 to 1977-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Silverbrook Anthracite Inc → Taylor B Strip; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vincent  Kassa → Silverbrook Anthracite Inc; 1977-08-01 to current/open; source msha-controller-operator-history