I efterfølgende liste er de i denne bog nævnte nuværende ledere og indehavere af virksomhederne anført i alfabetisk orden med henvisning til firma og sidetal. Indehavere der driver forretningen i eget navn, er ikke medtaget.
Ibsen jun. Even se W. Lang-reuter's Eftf. A/S...................................................356
--- Olga, frue, se Carl Ibsen...........................................................................269
--- R. Kaas se Vognfabrikken Scandia A/S........................................................636
Iisager Harald se A. Iisager & Søn..................................................................269
Ilbo Karen Ingeborg frue se G. Lundholm.........................................................377
Illum Else, frue, se A. C. Illum A/S..................................................................269
--- Svend se A. C. Illum A/S...........................................................................269
--- Thor se Jensen & Møller A/S......................................................................276
Ingemann T. O. se Kjær & Sommerfeldt...........................................................316
Ingholt Poul se Den Danske Landmandsbank....................................................132
Ingstrup Th. M. se Skive Tømerhandel A/S.......................................................553
Ingwersen C. B. se Adam's Transport Co. A/S.....................................................17
Ingvorsen H. Kalligrafen ...............................................................................310
Ipsen Carl se Janus Ipsen's Eftf. ....................................................................270
Ipsen Fr. Kr. se Holger Ipsen & Co..................................................................270
--- Holger H. L. se Holger Ipsen & Co..............................................................270
--- Kai S. se Carl Ipsen's Ligkistemagasin........................................................270
--- Kristian se Chr. Dam's Eftf........................................................................112
--- M. P. se Aakirkeby og Omegns Sparekasse......................................................2
Irgens-Hansen O. se Svendborg Eddikefabriker ................................................581
Isberg Kamma, frue, se Arnold Mouritzen, Vaskeriet "Milforth"............................408
Israelsen Alfred se Helsinge Mølle..................................................................238
--- Svend se P. Israelsen...............................................................................270
Iversen Anna Marie Schmidt, frue, se I I Iversen...............................................272
--- Chr. se Sønderborg Sten- og Billedhuggeri...................................................587
--- Chr. P. se Iversen & Larsen A/S.................................................................270
--- E. se Fabrikken Kosmos A/S......................................................................157
--- F. se Chr. Dyrberg's Røgeri A/S..................................................................143
--- H. se Staby Spare- og Laanekasse.............................................................568
--- I L. se "Elvi"............................................................................................148
--- Iver H. se Møller & Knudsen's Eftf..............................................................413
--- Jørgen Peter se L C. Teilmann & Co.'s Eftf...................................................593
--- Knud se Thingvad & Tougaard...................................................................596
--- Peter S. se Løgstør Læderhandel................................................................380
--- R. M. se Odder Trælasthandel A/S..............................................................452
--- Sv. Aage se M. H. Iversen.........................................................................272
--- Svend se Joh. Bruhn & Co...........................................................................71
--- Sv. Agerbæk se Agerbæk Iversen Magasin du Nord.......................................270
--- Vilh. se Ringsted Værktøjsmagasin.............................................................511
-- Jacob Bruno se F. C. Jacob, Glasteknik.........................................................272
--- Emma, frøken, se F. C. Jacob, Glasteknik....................................................272
--- Frans se Johs. Rosted...............................................................................515
--- Jacobsen A. se J. C. Jensen & Co., Odense
Dampdrejeri & Møbelfabrik........................................................................283
--- A. B. se Stjernholms Trælasthandel A/S......................................................574
--- Andreas se G. Noack................................................................................437
--- Andreas se Theodor Lund & Petersen A/S....................................................376
--- Andr. Møller se C. O. Jensen's Maskinfabrik A/S............................................279
--- Astrid, frøken, se Kg!. Frederiks Hospitals Apotek ........................................181
--- Axel Johs. se H. Jacobsens Klædehandel.....................................................273
--- Birger se Københavns Brødfabriker A/S........................................................342
--- Christian se Chr. Jacobsen & Sønner, Dansk Nellikekultur ..............................273
--- C. J. se H. Halmøe's Eftf...........................................................................213
--- C. S. E. se Stjernholms Trælasthandel A/S...................................................574
--- E. F. se F. Bülow & Co................................................................................82
--- E. H. se "Aux petits fours"..........................................................................37
--- Einar se Lollands Tidende........................................................................ 373
--- Ellen, frøken. se Waldemar Jacobsen..........................................................275
--- Ernst Emil se A. Larsen & F. J. Jacobsen......................................................357
--- F. se J. W. Juuk A/S.................................................................................298
--- Flemming se Bocks Boghandel.....................................................................61
--- Georg se Fyens Disconto Kasse.................................................................190
--- H. se Joh. Bruhn & Co................................................................................71
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