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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0546760 (1975-02-03) |
우선권정보 | UK-0020513 (1972-05-03) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 10 인용 특허 : 0 |
In a method of moulding gramophone records, the hole is formed by co-operating hole forming members which can extend into the mould cavity and which are pressed together at a position within the thickness of the record. One of the members is subsequently extended further and moves beyond this positi
A method of moulding a gramophone record including the steps of introducing mouldable material into a mould cavity between first and second mould parts through a nozzle tip which also acts as a hole-forming member and forming an aperture in the record during the formation of the record in said mould
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