| gptkbp:instanceOf | gptkb:electromechanical_computer 
 | 
                        
                            
                                | gptkbp:alsoKnownAs | gptkb:IBM_Automatic_Sequence_Controlled_Calculator 
 | 
                        
                            
                                | gptkbp:calculationSpeed | 1 multiplication in 6 seconds 3 additions per second
 
 | 
                        
                            
                                | gptkbp:category | gptkb:Harvard_University gptkb:IBM
 gptkb:personal_computer
 history of computing
 1944 establishments in the United States
 
 | 
                        
                            
                                | gptkbp:countryOfOrigin | gptkb:United_States 
 | 
                        
                            
                                | gptkbp:designer | gptkb:Howard_H._Aiken 
 | 
                        
                            
                                | gptkbp:exhibitedAt | gptkb:Harvard_Science_Center 
 | 
                        
                            
                                | gptkbp:firstOperator | gptkb:Grace_Hopper 
 | 
                        
                            
                                | gptkbp:height | 2.4 meters 
 | 
                        
                            
                                | gptkbp:influenced | gptkb:Harvard_Mark_III gptkb:Harvard_Mark_II
 gptkb:Harvard_Mark_IV
 
 | 
                        
                            
                                | gptkbp:input | punched paper tape 
 | 
                        
                            
                                | gptkbp:length | 15.5 meters 
 | 
                        
                            
                                | gptkbp:location | gptkb:Harvard_University 
 | 
                        
                            
                                | gptkbp:manufacturer | gptkb:IBM 
 | 
                        
                            
                                | gptkbp:notableUser | gptkb:Grace_Hopper gptkb:Howard_H._Aiken
 gptkb:John_von_Neumann
 gptkb:Robert_Campbell
 gptkb:Frank_H._Allen
 gptkb:Richard_Milton_Bloch
 gptkb:W._J._Eckert
 
 | 
                        
                            
                                | gptkbp:numberOfConstituents | over 750,000 parts 
 | 
                        
                            
                                | gptkbp:numberOfRelays | 3,304 
 | 
                        
                            
                                | gptkbp:numberOfSwitches | 2,000 
 | 
                        
                            
                                | gptkbp:operationalPeriod | 1944-1959 
 | 
                        
                            
                                | gptkbp:output | gptkb:SD_card gptkb:electromechanical_typewriter
 
 | 
                        
                            
                                | gptkbp:powerSource | electricity 
 | 
                        
                            
                                | gptkbp:programmingLanguage | machine code 
 | 
                        
                            
                                | gptkbp:significance | used during World War II one of the first programmable digital computers
 
 | 
                        
                            
                                | gptkbp:successor | gptkb:Harvard_Mark_II 
 | 
                        
                            
                                | gptkbp:technology | switches electromechanical relays
 clutches
 rotating shafts
 
 | 
                        
                            
                                | gptkbp:usedFor | military calculations scientific calculations
 
 | 
                        
                            
                                | gptkbp:weight | 4.5 tons 
 | 
                        
                            
                                | gptkbp:yearCompleted | 1944 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Howard_H._Aiken gptkb:Mark_I_computer
 
 | 
                        
                            
                                | gptkbp:bfsLayer | 4 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | Harvard Mark I 
 |