# Relationship history for MSHA mine 2901987

Current hierarchy: **Eddy Diane → Silver State Construction Company Inc → Aguilar 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:** K2b Constructors Inc → Aguilar Pit; 1985-04-01 to 1987-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Axel  Karlshoej → Aguilar Pit; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Axel  Karlshoej → K2b Constructors Inc; 1985-04-01 to 1987-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Silver State Construction Company Inc → Aguilar Pit; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eddy Diane → Aguilar Pit; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eddy Diane → Silver State Construction Company Inc; 1987-10-01 to current/open; source msha-controller-operator-history