Answer: OTTOS

AnswerCrossword Clue
OTTOSFour H.R.E. sovereigns
OTTOSHoly Roman emperors
OTTOSHoly Roman emperor et al.
OTTOSH.R.E. rulers
OTTOSFour H.R.E. rulers
OTTOSSeveral Holy Roman emperors
OTTOSPreminger and Bismarck
OTTOSGerman kings
OTTOSHahn, Harbach and Herz
OTTOSPreminger and Kruger
OTTOSKahn and Preminger
OTTOSKlemperer and Kruger
OTTOSSome Holy Roman Empire rulers
OTTOSFirst Reich rulers: 936-1002
OTTOSGraham and Kahn
OTTOSPreminger and Harbach
OTTOSGer. kings
OTTOSKruger and Graham
OTTOSSome Holy Roman emperors
OTTOSHarbach et al.
OTTOSDirector Preminger et al.
OTTOSFootball Hall-of-Famer Graham and others
OTTOSPhysics Nobelist Stern and others
OTTOSStephen King's "Uncle ... Truck"
OTTOSSome German men
OTTOSHRE's the Great and son
OTTOSPreminger et al.
OTTOSKlemperer and Bismarck
OTTOSHoly Roman Emperors I, II, III and IV
OTTOSPreminger and Dix
OTTOSChemistry Nobelist Hahn and others
ottosOTTO, a fragrant oil, also OTTAR
OTTOSConductor Klemperer and director Preminger
OTTOSPreminger and Klemperer
OTTOSHahn and Kahn
OTTOSKruger and Klemperer
OTTOSPreminger and Graham
OTTOSPreminger and others
OTTOSFour Holy Roman emperors
OTTOSPreminger et al.