# Relationship history for MSHA mine 3609640

Current hierarchy: **Nektarios M  Fitzpatrick → Lake Como Mill Quarry LLC → Lake Como 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Creamton Block Company LLC → Lake Como Quarry; 2008-07-01 to 2020-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Kevin  Schrader → Lake Como Quarry; 2008-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Schrader → Creamton Block Company LLC; 2008-07-01 to 2020-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Leo's 848 Products LLC → Lake Como Quarry; 2020-07-31 to 2026-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Nicholas A Shursky → Lake Como Quarry; 2020-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas A Shursky → Leo's 848 Products LLC; 2020-07-31 to 2026-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Lake Como Mill Quarry LLC → Lake Como Quarry; 2026-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nektarios M  Fitzpatrick → Lake Como Quarry; 2026-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nektarios M  Fitzpatrick → Lake Como Mill Quarry LLC; 2026-04-07 to current/open; source msha-controller-operator-history