# Relationship history for MSHA mine 4103786

Current hierarchy: **Daniel Marcus  Frost → Frost Crushed Stone Company Inc → Gregory Pit Kirkland Texas**

- 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

- **controller_controls_mine:** Daniel Marcus  Frost → Gregory Pit Kirkland Texas; 1992-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Frost Crushed Stone Company Inc → Gregory Pit Kirkland Texas; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Marcus  Frost → Frost Crushed Stone Company Inc; 1993-05-01 to current/open; source msha-controller-operator-history