# Relationship history for MSHA mine 2700527

Current hierarchy: **Joshua K Stevens; Alyssa S Stevens → K.A. Stevens & Son, Inc. → Coon Brook 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:** K.A. Stevens & Son, Inc. → Coon Brook Pit; 2022-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alyssa S Stevens et al → Coon Brook Pit; 2022-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alyssa S Stevens et al → K.A. Stevens & Son, Inc.; 2022-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joshua K Stevens et al → K.A. Stevens & Son, Inc.; 2022-04-26 to current/open; source msha-controller-operator-history