# Relationship history for MSHA mine 1101511

Current hierarchy: **First Site Construction Development Corp; Danielle  Schlichting; Robert → N-TRAK Group, LLC → Rockton Rock 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:** F M Porter & Sons → Rockton Rock Quarry; 1950-01-01 to 2004-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Roland E Porter et al → Rockton Rock Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roland E Porter et al → F M Porter & Sons; 1950-01-01 to 2004-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Leonard D Porter et al → F M Porter & Sons; 1950-01-01 to 2004-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Bruce E  Schlichting → Rockton Rock Quarry; 1981-02-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Schlichting and Sons Excavating, Inc. → Rockton Rock Quarry; 2004-04-12 to 2010-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Bruce E  Schlichting → Schlichting and Sons Excavating, Inc.; 2004-04-12 to 2010-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Three S Contractor Services LLC → Rockton Rock Quarry; 2010-06-01 to 2018-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Shirley  Schlichting et al → Rockton Rock Quarry; 2010-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shirley  Schlichting et al → Three S Contractor Services LLC; 2010-06-01 to 2018-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Pamela  Schlichting et al → Three S Contractor Services LLC; 2010-06-01 to 2018-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Danielle  Schlichting et al → Rockton Rock Quarry; 2017-09-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** N-TRAK Group, LLC → Rockton Rock Quarry; 2018-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Danielle  Schlichting et al → N-TRAK Group, LLC; 2018-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** First Site Construction Development Corp et al → N-TRAK Group, LLC; 2018-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Anderson et al → N-TRAK Group, LLC; 2018-05-16 to current/open; source msha-controller-operator-history