Statements (13)
| Predicate | Object | 
|---|---|
| gptkbp:instanceOf | 
                                    
                                        
                                            gptkb:spy_gadget
                                        
                                         | 
                            
| gptkbp:associatedWith | 
                                    
                                        
                                            
                                            Cold War espionage
                                        
                                        
                                         | 
                            
| gptkbp:can_be_opened | 
                                    
                                        
                                            
                                            yes
                                        
                                        
                                         | 
                            
| gptkbp:discoveredBy | 
                                    
                                        
                                            gptkb:New_York_City
                                        
                                         | 
                            
| gptkbp:material | 
                                    
                                        
                                            gptkb:metal
                                        
                                         | 
                            
| gptkbp:notableEvent | 
                                    
                                        
                                            gptkb:1953_hollow_nickel_case
                                        
                                         | 
                            
| gptkbp:similarTo | 
                                    
                                        
                                            
                                            ordinary coin
                                        
                                        
                                         | 
                            
| gptkbp:used_in | 
                                    
                                        
                                            gptkb:Central_Intelligence_Agency
                                        
                                         | 
                            
| gptkbp:usedFor | 
                                    
                                        
                                            
                                            covert communication
                                        
                                        
                                         concealing microfilm  | 
                            
| gptkbp:bfsParent | 
                                    
                                        
                                            gptkb:CIA_Technical_Services_Division
                                        
                                         | 
                            
| gptkbp:bfsLayer | 
                                    
                                        
                                            
                                            6
                                        
                                        
                                         | 
                            
| https://www.w3.org/2000/01/rdf-schema#label | 
                                    
                                        
                                            
                                            CIA hollow coin
                                        
                                        
                                         |