# Relationship history for MSHA mine 1800632

Current hierarchy: **James R  Matters; David G  Howson → Langenfelder Marine, Inc. → LOVE POINT DREDGE & TERMINAL**

- 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:** C J Langenfelder & Son Inc → LOVE POINT DREDGE & TERMINAL; 1950-01-01 to 2002-09-30; source msha-controller-operator-history
- **controller_controls_mine:** C J Langenfelder & Son Inc → LOVE POINT DREDGE & TERMINAL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C J Langenfelder & Son Inc → C J Langenfelder & Son Inc; 1950-01-01 to 2002-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Langenfelder Marine, Inc. → LOVE POINT DREDGE & TERMINAL; 2002-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James R  Matters et al → LOVE POINT DREDGE & TERMINAL; 2002-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Matters et al → Langenfelder Marine, Inc.; 2002-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David G  Howson et al → Langenfelder Marine, Inc.; 2002-10-01 to current/open; source msha-controller-operator-history