Dear May Wang
Thank you for your e-mail.
I am troubled that is P-3301L half of LS-F about the antirust period.
I don’t think that the cause of trademark damage is anti-rust oil.
If it causes , trademark of all blades will be damaged.
I think that it is condition of the blade’s surface before marking.
For example , it is partially greasy.
Please tell me production process before marking.