# Relationship history for MSHA mine 3603161

Current hierarchy: **J Kevan  Busik → DELAWARE VALLEY LANDSCAPE STONE INC → DELAWARE VALLEY LANDSCAPE**

- 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:** A L Lewis Inc → DELAWARE VALLEY LANDSCAPE; 1950-01-01 to 1983-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Lewis A L Inc → DELAWARE VALLEY LANDSCAPE; 1950-01-01 to 1983-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Lewis A L Inc → A L Lewis Inc; 1950-01-01 to 1983-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Delaware Valley Landscape Stone Inc → DELAWARE VALLEY LANDSCAPE; 1983-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J Kevan  Busik  et al → DELAWARE VALLEY LANDSCAPE; 1983-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Kevan  Busik  et al → Delaware Valley Landscape Stone Inc; 1983-08-09 to current/open; source msha-controller-operator-history