# Relationship history for MSHA mine 3610385

Current hierarchy: **Anthony  Pykus; William B  Pykus → Bill Pykus Excavating Inc. → Shursky Quarry**

- 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

- **controller_controls_mine:** William L  Pykus → Shursky Quarry; 2011-06-16 to 2023-05-25; source msha-controller-operator-history
- **operator_operates_mine:** Bill Pykus Excavating Inc. → Shursky Quarry; 2022-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William L  Pykus → Bill Pykus Excavating Inc.; 2022-04-12 to 2023-05-25; source msha-controller-operator-history
- **controller_controls_mine:** William B  Pykus et al → Shursky Quarry; 2023-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William B  Pykus et al → Bill Pykus Excavating Inc.; 2023-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony  Pykus et al → Bill Pykus Excavating Inc.; 2023-05-26 to current/open; source msha-controller-operator-history