# Relationship history for MSHA mine 1700871

Current hierarchy: **Lawrence  Willey; Michael J  Del Sesto → Old York Quarry Inc. → Old York Quarry Inc.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Old York Quarry Inc. → Old York Quarry Inc.; 2011-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael J  Del Sesto et al → Old York Quarry Inc.; 2011-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael J  Del Sesto et al → Old York Quarry Inc.; 2011-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence  Willey et al → Old York Quarry Inc.; 2011-04-26 to current/open; source msha-controller-operator-history