Patent Application - Improvements in or relating to telephone systems

Keywords	DePenning Patent Standard Telephones Circuit Arrangement Subscriber Tone Generator Intercommunication System
Ministry/ Department/ Residency	PATENTS AND DESIGNS KOLKATA
Branch	Kolkata
From Year / Date (YYYY-MM-DD)	1963
To Year / Date (YYYY-MM-DD)	1963
Identifier	NAIBHF00009561
File No./Reference No./Sheet No./Folio No.	87837
Location	BBSR-R1
File Size	32.2 MB
Pages	18
Language	English
Bundle Barcode	NAIBHB00000340
File Barcode	NAIBHF00009561
QC Certificate No.	QC_20240708BH
Bundle No.	148