# Relationship history for MSHA mine 4402242

Current hierarchy: **Adams Construction; Salem Stone Corp → Sisson & Ryan Quarry, LLC → SISSON & RYAN 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

- **operator_operates_mine:** Sisson & Ryan Inc → SISSON & RYAN QUARRY; 1950-01-01 to 2010-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Clark Daniel  Sisson → SISSON & RYAN QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clark Daniel  Sisson → Sisson & Ryan Inc; 1950-01-01 to 2010-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Sisson & Ryan Quarry, LLC → SISSON & RYAN QUARRY; 2010-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Salem Stone Corp et al → SISSON & RYAN QUARRY; 2010-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salem Stone Corp et al → Sisson & Ryan Quarry, LLC; 2010-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adams Construction et al → Sisson & Ryan Quarry, LLC; 2010-04-01 to current/open; source msha-controller-operator-history