# Relationship history for MSHA mine 2301668

Current hierarchy: **Danny  Van Gennip → Van Gennip Sand & Gravel → PORTABLE NO 2**

- 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:** L L James Sand & Gravel Company → PORTABLE NO 2; 1950-01-01 to 1979-06-12; source msha-controller-operator-history
- **controller_controls_mine:** James L L Sand & Gravel Company → PORTABLE NO 2; 1950-01-01 to 1979-06-12; source msha-controller-operator-history
- **controller_controls_operator:** James L L Sand & Gravel Company → L L James Sand & Gravel Company; 1950-01-01 to 1979-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Gary'S Sand & Gravel → PORTABLE NO 2; 1979-06-13 to 1998-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Gary D  Hahn  et al → PORTABLE NO 2; 1979-06-13 to 1998-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Gary D  Hahn  et al → Gary'S Sand & Gravel; 1979-06-13 to 1998-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Van Gennip Sand & Gravel → PORTABLE NO 2; 1998-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Danny  Van Gennip → PORTABLE NO 2; 1998-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Danny  Van Gennip → Van Gennip Sand & Gravel; 1998-11-04 to current/open; source msha-controller-operator-history