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invaild - Coggle Diagram

- - - - D1. United States Patent Number 5,447,511
        
        D2. United States Patent Number 4,037,716
        
        D3. United States Patent Number 5,857,237
        
        D4. Germany Patent Number DE9403952 U1
- - - - daily product
  - - - would/could test
      - skilled person
      - obvious
    - - credit card
      - slot in the corner
    - - D1 cord-->>carry
    - - prior art
    - - explain basic