# Relationship history for MSHA mine 2100880

Current hierarchy: **Heath  Line; Kerry  Abramson; Thomas  Kvas; Pauline  Rutchasky → Superior Forrest Aggregates Inc. → Jammer Lake Pit - Virginia**

- 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:** Concrete Managers Company → Jammer Lake Pit - Virginia; 1950-01-01 to 1980-05-08; source msha-controller-operator-history
- **controller_controls_mine:** Jerome  Kolstad → Jammer Lake Pit - Virginia; 1950-01-01 to 1980-05-08; source msha-controller-operator-history
- **controller_controls_operator:** Jerome  Kolstad → Concrete Managers Company; 1950-01-01 to 1980-05-08; source msha-controller-operator-history
- **operator_operates_mine:** Seppi Brothers Concrete  Products  Corp → Jammer Lake Pit - Virginia; 1980-05-09 to 2026-02-18; source msha-controller-operator-history
- **controller_controls_mine:** Matt  Seppi → Jammer Lake Pit - Virginia; 1980-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matt  Seppi → Seppi Brothers Concrete  Products  Corp; 1980-05-09 to 2026-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Superior Forrest Aggregates Inc. → Jammer Lake Pit - Virginia; 2026-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pauline  Rutchasky et al → Jammer Lake Pit - Virginia; 2026-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pauline  Rutchasky et al → Superior Forrest Aggregates Inc.; 2026-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kerry  Abramson et al → Superior Forrest Aggregates Inc.; 2026-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heath  Line et al → Superior Forrest Aggregates Inc.; 2026-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Kvas et al → Superior Forrest Aggregates Inc.; 2026-02-19 to current/open; source msha-controller-operator-history