# Relationship history for MSHA mine 3602163

Current hierarchy: **Maria  Cantwell; Bonnie R Ryan; Brian R Rich → Reading Anthracite Company → Knickerbocker M-112**

- 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:** Reading Anthracite Company → Knickerbocker M-112; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John W  Rich et al → Knickerbocker M-112; 1950-01-01 to 2023-01-17; source msha-controller-operator-history
- **controller_controls_operator:** John W  Rich et al → Reading Anthracite Company; 1950-01-01 to 2023-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Brian R Rich et al → Knickerbocker M-112; 2023-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian R Rich et al → Reading Anthracite Company; 2023-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maria  Cantwell et al → Reading Anthracite Company; 2023-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bonnie R Ryan et al → Reading Anthracite Company; 2023-01-18 to current/open; source msha-controller-operator-history