A rotary switch (1) fitted with signalling means to provide a visual indication of the operating condition of an actuator device, comprises a switch body (2) made of metal or coated externally in metal and a cover (4). The cover (4) is joined to close the switch body (2) by means of a plurality of attachment screws (5) in metal or externally coated in metal, each housed in seats (45,25) arranged in the cover (4) and in the switch body (2). In particular, inside the seat (25) of the switch body (2) there is an insert (6) made of a material suitable to prevent the circulation of galvanic currents between the seat (25) of the switch body (2) and the attachment screw (5).

Disclosed herein are a keyboard manufacturing apparatus and method that provide improved printing of at least one of a letter, a symbol, a number, and a pattern onto a keycap of a keyboard. The keyboard manufacturing apparatus includes a loader to load a keyboard, an unloader to unload the keyboard, a printing device provided between the loader and the unloader to print at least one of the letter, symbol, number and pattern onto the keyboard, wherein the printing device includes a support on which the keyboard is positioned, and an inkjet unit (100) to print the at least one of the letter, symbol, number and pattern onto the keyboard, wherein the inkjet unit (100) includes an inkjet head (20) containing ink with a colour identical to a specific colour to be printed onto the keyboard, and a hardeners (12, 13) positioned on one side of the inkjet head (20) to dry the ink.

Problems resulting from contamination of electronic apparatus (15) used with silicone keypads can be eliminated or substantially reduced by soaking such keypads (12) prior to assembly in a low molecular weight liquid hydrocarbon (17), particularly n-hexane. Such soaking removes low molecular weight unreactive cyclics from the keypad which might otherwise contaminate the electronic apparatus.