# Relationship history for MSHA mine 4100914

Current hierarchy: **Banks John L Jr → Texeramics Inc → Kelley Pit**

- 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:** Texeramics Inc → Kelley Pit; 1950-01-01 to 1986-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Zanowiak Peter P → Kelley Pit; 1950-01-01 to 1986-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Zanowiak Peter P → Texeramics Inc; 1950-01-01 to 1986-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Texeramics Inc → Kelley Pit; 1986-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Banks John L Jr → Kelley Pit; 1986-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Banks John L Jr → Texeramics Inc; 1986-07-22 to current/open; source msha-controller-operator-history