Methods for processing photomasks are provided herein. The refill for an oil-based ink ballpoint pen includes a volatilization-inhibiting seal member, for example, a sealing coat prepared by melting and solidifying an olefin base thermoplastic sticking agent is formed at the point part a tip of a refill for an oil-based ink ballpoint pen charged with a volatile oil-based ink having a specific physical property. Particularly, in the cover glass for the solar cell panel, the transparent protective film is preferably formed by bonding the zinc telluride with silica binders. An opening is located generally opposite the fold structure. The measured oxygen carrying capacity can also be used to determine hematocrit and to distinguish between blood samples and control solutions applied to a test strip. The bias voltage generating portion is configured to generate body voltages for transistors of the first inverter and the second inverter so that an offset between electric currents flowing through the differential input portion can be adjusted.