Spring bow compass with interchangeable points for precision drawing instruments (P)
精密绘图仪器用带可互换点的弹簧弓罗盘（P）

1994-03-01

Compass with interchangeable points for standard drawing instruments
标准绘图仪器用带可互换点的罗盘

1996-11-01

Fixed centre spring bow with interchangeable points for precision drawing instruments (P)
精密绘图仪器（P）用带可互换点的固定中心弹簧弓架

1994-07-01

Pencil points for precision drawing instruments (P)
精密绘图仪器用铅笔头（P）

1994-07-01

Divider points for precision drawing instruments (P)
精密绘图仪器的分隔点（P）

1994-07-01

Pen points for precision drawing instruments (P)
精密绘图仪器用笔尖（P）

1994-07-01