# Relationship history for MSHA mine 4503751

Current hierarchy: **Dylan  Parsons; Mike  Parsons → Black Lake Resources Nisqually Inc → Nisqually**

- 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:** Black Lake Quarry LLC → Nisqually; 2016-08-24 to 2017-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Mike  Parsons et al → Nisqually; 2016-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Parsons et al → Black Lake Quarry LLC; 2016-08-24 to 2017-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Dylan  Parsons et al → Black Lake Quarry LLC; 2016-08-24 to 2017-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Black Lake Resources Nisqually Inc → Nisqually; 2017-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dylan  Parsons et al → Nisqually; 2017-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dylan  Parsons et al → Black Lake Resources Nisqually Inc; 2017-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Parsons et al → Black Lake Resources Nisqually Inc; 2017-03-26 to current/open; source msha-controller-operator-history