# Relationship history for MSHA mine 2103067

Current hierarchy: **Peter  Fischer → Fischer Aggregates → PIT 83**

- 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 Aggregates → PIT 83; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peter  Fischer  et al → PIT 83; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter  Fischer  et al → Fischer Aggregates; 1993-06-01 to current/open; source msha-controller-operator-history