# Relationship history for MSHA mine 3607716

Current hierarchy: **Kenneth M  Pollock → Newport Aggregate → Susquehanna Anthracite**

- 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:** Culmtech Ltd → Susquehanna Anthracite; 1985-07-01 to 1987-03-17; source msha-controller-operator-history
- **controller_controls_mine:** David M  Small → Susquehanna Anthracite; 1985-07-01 to 1987-03-17; source msha-controller-operator-history
- **controller_controls_operator:** David M  Small → Culmtech Ltd; 1985-07-01 to 1987-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Culmtech Ltd → Susquehanna Anthracite; 1987-03-18 to 1989-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Fred R  Davis → Susquehanna Anthracite; 1987-03-18 to 1989-06-04; source msha-controller-operator-history
- **controller_controls_operator:** Fred R  Davis → Culmtech Ltd; 1987-03-18 to 1989-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Hudson Anthracite Inc → Susquehanna Anthracite; 1989-06-05 to 1995-12-21; source msha-controller-operator-history
- **controller_controls_mine:** John  Popple → Susquehanna Anthracite; 1989-06-05 to 1995-12-21; source msha-controller-operator-history
- **controller_controls_operator:** John  Popple → Hudson Anthracite Inc; 1989-06-05 to 1995-12-21; source msha-controller-operator-history
- **operator_operates_mine:** Hudson Anthracite Inc → Susquehanna Anthracite; 1995-12-22 to 2014-11-12; source msha-controller-operator-history
- **controller_controls_mine:** David  Popple et al → Susquehanna Anthracite; 1995-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Popple et al → Hudson Anthracite Inc; 1995-12-22 to 2014-11-12; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Popple et al → Hudson Anthracite Inc; 1995-12-22 to 2014-11-12; source msha-controller-operator-history
- **operator_operates_mine:** Newport Aggregate → Susquehanna Anthracite; 2014-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth M  Pollock et al → Susquehanna Anthracite; 2014-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth M  Pollock et al → Newport Aggregate; 2014-11-13 to current/open; source msha-controller-operator-history