# Relationship history for MSHA mine 0600588

Current hierarchy: **Matthew T  Kobyluck → Kobyluck Sand & Gravel Inc → Montville Pit**

- 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:** S N M Associates → Montville Pit; 1980-07-01 to 1986-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  Dellaquila et al → Montville Pit; 1980-07-01 to 1986-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Dellaquila et al → S N M Associates; 1980-07-01 to 1986-07-29; source msha-controller-operator-history
- **operator_operates_mine:** Kobyluck Sand & Gravel Inc → Montville Pit; 1986-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel  W  Kobyluck → Montville Pit; 1986-07-30 to 2009-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Daniel  W  Kobyluck → Kobyluck Sand & Gravel Inc; 1986-07-30 to 2009-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Matthew T  Kobyluck et al → Montville Pit; 2009-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew T  Kobyluck et al → Kobyluck Sand & Gravel Inc; 2009-06-16 to current/open; source msha-controller-operator-history