# Relationship history for MSHA mine 2402355

Current hierarchy: **Dan K  Fischer → Western Stone LLC → Fischer Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Fischer Construction → Fischer Quarry; 2004-03-17 to 2005-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Dan K  Fischer → Fischer Quarry; 2004-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan K  Fischer → Fischer Construction; 2004-03-17 to 2005-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Western Stone LLC → Fischer Quarry; 2005-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dan K  Fischer → Fischer Quarry; 2005-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan K  Fischer → Western Stone LLC; 2005-04-01 to current/open; source msha-controller-operator-history