# Relationship history for MSHA mine 2102646

Current hierarchy: **Kobliska Frank → Ideal Blacktopping & Construction Company → Portable Crusher**

- 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:** Myrtle A  Starry → Portable Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Starry Construction Company Inc → Portable Crusher; 1978-03-09 to 1985-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Myrtle A  Starry → Starry Construction Company Inc; 1978-03-09 to 1985-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Ideal Blacktopping & Construction Company → Portable Crusher; 1985-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kobliska Frank → Portable Crusher; 1985-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kobliska Frank → Ideal Blacktopping & Construction Company; 1985-07-23 to current/open; source msha-controller-operator-history