Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Inventor
Hahnemann Adolphus Cutmore
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IndividualfiledCriticalIndividual
Application grantedgrantedCritical
Publication of GB190505149ApublicationCriticalpatent/GB190505149A/en
Respiratory Apparatuses And Protective Means
(AREA)
Abstract
5149. Cutmore, H. A. March 11. Speaking-tubes.-Conversation may be carried on in a whisper by employing a mouthpiece such as that shown in Fig. 1. Vents C, or the serrated edge shown in Fig. 2, permit free breathing.
GB190505149D1905-03-111905-03-11Improvements in or relating to Telephone and like Transmitters.
ExpiredGB190505149A
(en)