Barrier member for a telescope

Barrier opening and closing apparatus

Base body of a reflecting mirror and method for the preparation

Base body of a reflecting mirror and method for the preparation

Base body of reflecting mirror and method for preparing the same

Base body of reflecting mirror and method for preparing the same

Base body of reflecting mirror and method for preparing the same

Base plate, lens sheet, and projection screen

Base station performance enhancements for infrared-linked teleph

Bathroom mirror demister

Battery module transceiver for extending the range of an...

Battery operated projection screen with spring assisted roller a

Bayonet mount and optical apparatus

Bayonet type fixing device having annular members and a zoom...

Beaded rear projection screen with tunable gain

Beam alignment correction element assembly

Beam alignment correction element assembly

Beam alignment device and method

Beam array pitch controller

Beam blocking and combining optic