# Relationship history for MSHA mine 1500104

Current hierarchy: **Steve L  Lawson → Valley Stone Llc → VALLEY STONE, LLC QUARRY 2**

- 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:** Ken-Mor Stone Inc → VALLEY STONE, LLC QUARRY 2; 1978-03-09 to 2001-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Ruth → VALLEY STONE, LLC QUARRY 2; 1978-03-09 to 2001-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Ruth → Ken-Mor Stone Inc; 1978-03-09 to 2001-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Valley Stone Llc → VALLEY STONE, LLC QUARRY 2; 2001-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve L  Lawson et al → VALLEY STONE, LLC QUARRY 2; 2001-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve L  Lawson et al → Valley Stone Llc; 2001-07-01 to current/open; source msha-controller-operator-history