# Relationship history for MSHA mine 2100514

Current hierarchy: **Peter  Fischer → Fischer Sand & Aggregate LLP → Fischer Sand & Aggregate**

- 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:** Fischer Sand & Aggregate LLP → Fischer Sand & Aggregate; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peter  Fischer  et al → Fischer Sand & Aggregate; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter  Fischer  et al → Fischer Sand & Aggregate LLP; 1950-01-01 to current/open; source msha-controller-operator-history