# Relationship history for MSHA mine 2302250

Current hierarchy: **Robert G  Fischer; Francis P  Fischer → Fischer Quarry & Hauling LLC → Hardstone Pit #1**

- 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 Quarry & Hauling LLC → Hardstone Pit #1; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Francis P  Fischer  et al → Hardstone Pit #1; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Francis P  Fischer  et al → Fischer Quarry & Hauling LLC; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert G  Fischer  et al → Fischer Quarry & Hauling LLC; 2001-09-01 to current/open; source msha-controller-operator-history