# Relationship history for MSHA mine 2800483

Current hierarchy: **Rombough Allan → Berkshire Sand & Stone Inc → Berkshire Sand & Stone Company Incorpora**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Berkshire Sand & Stone Company Inc → Berkshire Sand & Stone Company Incorpora; 1950-01-01 to 1986-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Wade Phillip → Berkshire Sand & Stone Company Incorpora; 1950-01-01 to 1986-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Wade Phillip → Berkshire Sand & Stone Company Inc; 1950-01-01 to 1986-04-21; source msha-controller-operator-history
- **operator_operates_mine:** Berkshire Sand & Stone Inc → Berkshire Sand & Stone Company Incorpora; 1986-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rombough Allan → Berkshire Sand & Stone Company Incorpora; 1986-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rombough Allan → Berkshire Sand & Stone Inc; 1986-04-22 to current/open; source msha-controller-operator-history